Topics to be Learn : The Complexity of Mapping the Earth The Blue of the Blue Planet — The Oceans The Continents: Variety on Land

The Complexity of Mapping the Earth :

The Earth is an oblate spheroid — a nearly spherical shape that bulges slightly at the equator and is flattened at the poles due to its rotation.

Since maps show the Earth on a flat surface, some distortion is unavoidable — just as an orange peel cannot be flattened without tearing.

KEY TERM — Map Projection - The process of showing the curved surface of the Earth on a flat surface. Cartographers (people who draw maps) use different projection methods — some preserve shape but distort size; others preserve size but distort shape.

 Colour Code Used in Physical Maps :

Colour	Represents
Blue	Water bodies — oceans, seas, lakes, rivers
Green	Plains
Yellow / Brown	Plateaus
Dark Brown	High mountains
Light Yellow	Deserts
White	Ice and glaciers

Two Important Map Projections :

Projection	Feature	Limitation
Mercator Projection	Preserves shape and direction; useful for navigation	Greatly distorts size near the poles (e.g., Greenland appears as big as Africa, though it is actually smaller than India)
Robinson Projection	A compromise map balancing size and shape distortion	Gives a visually realistic look but is not perfectly accurate either

Note: Since every map is a compromise, we must look at multiple projections to understand the world fairly. Professionals use latitude and longitude coordinates for greater precision.

The Blue of the Blue Planet — The Oceans :

DEFINITION — Ocean : A vast body of saltwater covering about 71% of the Earth's surface. Oceans hold 97% of the Earth's water. This is why the Earth appears blue from space and is called the 'Blue Planet'.

• Oceans support life — from tiny plankton (microscopic organisms with chlorophyll that use sunlight and carbon dioxide to make food) to giant blue whales (over 30 m long, ~150,000 kg).
• Oceans regulate climate by absorbing heat, slowly releasing it, and adding moisture to the air (forming clouds and rainfall).
• The ocean floor is NOT flat — it has mountains, valleys, and plains, just like land.
• Oceans provide almost half the oxygen we breathe, largely through tiny marine plankton.

The Five Oceans :

Ocean	Key Feature
Pacific Ocean	Largest and deepest ocean; rich in whales and tuna
Atlantic Ocean	One of the busiest waterways for trade and transport; rich fishing ground
Indian Ocean	Warm waters, rich biodiversity; historically important for international trade
Arctic Ocean	Smallest and shallowest; covered with sea ice; home to polar bears and walruses
Southern Ocean	Encircles Antarctica; home to penguins and seals

Ocean Currents :

Ocean currents are like giant rivers flowing through the ocean, and they affect the climate of coastal areas.

Type	Direction	Effect
Warm currents	Flow from the Equator toward the poles	Warm nearby coastal areas
Cold currents	Flow from the poles toward the Equator	Cool nearby coastal areas

EXAMPLE — The Gulf Stream : Flows north from near the Equator through the Atlantic Ocean towards Western Europe, making places like the United Kingdom warmer than other places at the same latitude.

Ocean Trenches :

These V-shaped areas are the harshest environments on Earth. The Mariana Trench includes the Challenger Deep, which reaches over 11,000 meters below sea level—roughly 2,000 meters deeper than the height of Mount Everest

Feature	Detail
Deepest trench	Mariana Trench
Depth comparison	Over 2,000 m deeper than the height of Mount Everest
Deepest point	Challenger Deep — over 11,000 m below sea level
Conditions	Near-freezing temperatures, high pressure, complete darkness
Life forms	Survive using chemosynthesis (using energy from chemicals in water) instead of photosynthesis, since there is no light

The Great Barrier Reef :

DEFINITION — Reef : A reef is a ridge near the ocean surface, formed naturally or artificially. A reef is usually made of rocks, sand, or the hard skeletons of marine organisms.

Coral Reef :

The most common type is a coral reef.

• Coral reefs are formed mainly by tiny sea animals called coral polyps.
• They build hard skeletons of calcium carbonate.
• Over many years, these skeletons accumulate and form large reefs.
• Coral reefs provide food and shelter for many marine animals.
• They are often called the “rainforests of the sea” because of their rich biodiversity.

Example: The Great Barrier Reef in Australia is the world's largest coral reef system.

• Location: Off Australia's northeastern coast
• Length: Over 2,000 km; Area: About 350,000 sq. km
• Provides food and shelter to about one-quarter of all ocean species (fish, crabs, turtles, sponges)
• Recognised as a UNESCO World Heritage Site
• Threats: Overfishing, pollution, and climate change cause coral bleaching (loss of colour and death of coral due to changes in ocean chemistry, largely caused by human activity)

Smaller Water Bodies and Waterways :

Type	Description	Example
Sea	Large, partly enclosed saltwater area connected to an ocean	Arabian Sea
Gulf	Large inlet of the sea deeply cutting into land	Persian Gulf
Bay	Smaller, broad inlet of the sea	Bay of Bengal (world's largest bay)
Strait	Narrow channel joining two seas or oceans	Strait of Malacca
Canal	Man-made channel connecting water bodies	Suez Canal

Importance of Smaller Water Bodies and Waterways :

The Suez Canal :

• A human-made passage opened in 1869, connecting the Red Sea with the Mediterranean Sea.
• It created the shortest maritime waterway from India/the Indian Ocean to Europe.

Persian Gulf :

• The Persian Gulf has been an important route for trade between India and Europe for thousands of years.
• The bay provides safe heavens for ports and dockyards shielding them from the strong winds of the open oceans.

The Bay of Bengal :

• The world's largest bay. It influences climate, supports diverse flora and fauna, and has historically been significant in trade.

The Continents: Variety on Land :

Recap: Landforms (from Grade 6) :

Landforms of the world include mountains, plateaus, and plains.

Landform	Description
Mountain	Landforms much higher than surrounding land; broad base, steep slopes, narrow summit
Plateau	Landforms that rises from surrounding land with a flat top; often has steep sides
Plain	Landforms that have extensive flat or gently undulating surface; no large hills or deep valleys
Desert	Large, dry area with very little precipitation and unique flora/fauna

Continent : A large continuous expanse of land is called a continent. The most common count is of seven continents: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.

ASIA :

(i) Tibetan Plateau — 'Roof of the World' :

The Tibetan Plateau is the highest and largest plateau in the world. It is called the “Roof of the World” because of its great height.

Location and Size :

• The plateau lies north of the Himalayan Range.
• It stretches about 2,500 km from east to west and 1,000 km from north to south.
• Its average height is more than 4,500 metres above sea level.

Formation :

• The Tibetan Plateau was formed by the powerful collision of the Indo-Australian and Eurasian tectonic plates.
• The same geological forces also helped form the Himalayan Mountains.

“Third Pole” :

• The plateau has vast glaciers and ice fields.
• It is called the “Third Pole” because it contains huge amounts of frozen freshwater outside the Arctic and Antarctic regions.
• The melting ice and snow provide water to many parts of Asia.

Source of Major Rivers :

• Several important Asian rivers originate from the Tibetan Plateau. These include the Indus, Brahmaputra, and Yangtze rivers.
• Therefore, the plateau is very important for water supply and the climate of Asia.

Effect of Climate Change :

• The Tibetan Plateau is highly sensitive to global warming.
• Rising temperatures are causing faster melting of snow and glaciers.
• This has caused some lakes to expand, while new lakes are also forming.

Life at High Altitude :

• Living at an average height of 4,500 metres is physically challenging.
• The air is thinner and contains less oxygen than at lower elevations.
• People and animals living in this region have developed special adaptations to survive at such high altitudes.

(ii) Gobi Desert — 'Land of the Eternal Blue Sky' :

The Gobi Desert is located in East Asia. It is a famous example of a cold desert.

Location :

• The Gobi Desert lies mainly in Mongolia. A part of the desert also extends into northern China.

Climate :

• Mongolia is known as the “Land of the Eternal Blue Sky” because it has many sunny days.
• The Gobi has a very cold winter climate. Winter temperatures can fall to about –30°C.
• Like other deserts, the Gobi receives less than 25 cm of rainfall each year.

Vegetation and Pastoral Life :

• The harsh climate results in sparse vegetation.
• Local herders move their animals from one place to another to find seasonal pastures.
• Underground water is very important for supporting vegetation and livestock.
• Human settlements have adapted to the harsh environment, with Buddhist monasteries found near the desert.

Renewable Energy :

• The Gobi receives plenty of sunlight and has strong winds.
• These natural conditions are used to produce renewable energy.
• Solar panels and wind turbines are used to generate electricity.

(iii) The Eurasian Steppes :

The Eurasian Steppes are a vast temperate grassland stretching over 8,000 km across Eurasia and spanning 13 different modern countries from Central Europe to East Asia.

Climate :

• The steppes have a temperate climate.
• They have hot summers and cold winters.
• Rainfall is moderate and often seasonal.

Environmental Importance :

• The grasslands act as an important carbon sink.
• They absorb carbon dioxide from the atmosphere and store it in the soil.
• This helps reduce the greenhouse effect.

Wildlife and Migratory Birds :

• The grasslands and nearby water bodies provide important resting places for migratory birds, such as the Siberian crane.
• The steppe tortoise is also found in this region. It lives in burrows that can be up to 2 metres deep and hibernates for several months.
• In 1968, two steppe tortoises travelled around the Moon aboard a Soviet spacecraft, becoming some of the first living beings from Earth to travel to the Moon.

Nomadic Culture :

• The steppes have traditionally supported nomadic communities.
• Nomadic people often live in yurts, which are portable huts.
• Yurts are well suited to life on the wide, open plains because they can be moved from one place to another.

(iv) The Ural Mountains :

• Location and Extent : The Ural Mountains stretch for about 2,500 km. They extend from the Arctic Ocean in the north to the border of Kazakhstan in the south.
• Natural Boundary : The Ural Mountains form a natural boundary between Europe and Asia.
• Mineral Resources : The mountains are rich in many minerals and natural resources. Important resources include iron, copper, zinc, platinum, gold, coal, oil and natural gas.
• Forests and Wildlife : Coniferous taiga forests are found on the western and eastern sides. Deciduous forests are mainly found in the south. These forests provide habitats for animals such as brown bears, wolves, lynx, elk, reindeer and sable.
• Landscapes and Importance : The northern part has tundra and swamps, while the southern part has fertile farmland. The Ural Mountains are important for ecology, natural beauty and economic activities.

KEY TERM — Water Towers : Mountains are called 'water towers' because their height allows them to provide freshwater to surrounding regions through melting snow and glaciers.

KEY TERM — Tundra & Permafrost

• Tundra: A treeless, cold plain where the soil (permafrost) stays frozen most of the time, trapping greenhouse gases like carbon dioxide and methane. Global warming melts the permafrost, releasing these gases and speeding up climate change.
• Swamp: Land that is always wet and partly covered with water.

EUROPE :

(i) The European Plain :

The European Plain (also known as the Great European Plain) is one of the largest flat lands in the world, spanning across several countries west of the Ural Mountains.

Its key geographical, economic, and historical aspects include:

• Landscape Characteristics: The plain is characterized by low-lying terrain, gentle rolling hills, and several wide river valleys.
• Agricultural Importance: Because of its highly fertile soils, it is one of the most productive agricultural regions globally. It is widely used to cultivate crops such as wheat, barley, rye, and potatoes.
• Resources and Trade: The region contains deposits of coal, oil, and natural gas, which have been crucial for economic growth. Its rivers also play an important role in facilitating trade and transport.
• Major Urban Hubs: The flat land and favorable climate have supported the growth of major cities, including Moscow, Berlin, Paris, Amsterdam, and Warsaw.
• Strategic History: The plain has historically served as a ground for major battles, with various rulers repeatedly competing to take control of it. Today, it continues to be vital for Europe's economy, especially for agriculture and transportation.

(ii) The Alps :

The Alps are a major crescent-shaped mountain range in south-central Europe. They stretch for about 1,200 km and form a natural barrier in Europe. Mont Blanc is one of the most famous peaks of the Alps.

• Tourism and Landscapes : The Alps are famous for their beautiful and picturesque landscapes. They are popular for activities such as skiing, hiking, and mountaineering. Tourists visit the Alps throughout the year.
• Diverse Flora : Vegetation changes with the increase in altitude. Oak and beech forests are found at lower levels. Spruce and pine trees grow at higher elevations. Edelweiss, a famous alpine flower, grows in the high mountain regions.
• Rich Wildlife : The Alps provide a natural habitat for many animals. Important animals include ibex, chamois, marmots, golden eagles, lynxes, wolves, and brown bears.
• Vital Water Supply : The Alps are called the “water tower of Europe” because they store and supply large amounts of water. They feed major rivers such as the Rhine and tributaries of the Danube. This water is used for drinking, irrigation, and hydroelectric power.
• Natural Resources : The Alpine region has dense forests and fertile lands. It also contains minerals such as iron, copper, lead, rock salt, graphite, gypsum, and magnesite.

The Great European Plain stretches from France and the Pyrenees in the west to the Russian Ural Mountains in the east, covering parts of 17 nations.

AFRICA :

(i) The Sahara Desert :

The Sahara Desert, located in Africa, is the largest hot desert in the world.

Climate :

• The Sahara has an extremely dry climate.
• It receives less than 25 cm of rainfall each year.
• Temperatures usually range from 30°C to 46°C and can sometimes rise above 50°C.

Plants and Animals :

• Plants and animals in the Sahara have special adaptations to survive extreme heat and lack of water.
• Some desert plants store water in their tissues to survive dry conditions.
• Oases provide water and support the growth of date palm trees.
• The Saharan fennec fox has large ears that help it release heat and detect prey underground.

Nomadic Culture :

• The Sahara has traditionally been home to nomadic tribes. They herd animals such as camels, goats, and sheep.
• Ancient trade routes across the Sahara carried goods such as gold and salt to the Mediterranean region.
• People use light, heat-resistant clothing and sometimes build underground homes to stay cooler in summer and warmer in winter.

Environmental Importance :

• The Sahara plays an important role in the global ecosystem.
• Dust from the Sahara can travel across the Atlantic Ocean to the Amazon Rainforest.
• This dust contains phosphorus, which helps provide nutrients to plants in the rainforest.

(ii) The African Savannah :

The African Savannah is a tropical grassland ecosystem with wide open grasslands and scattered trees.

Location :

• The savannah mainly lies between tropical rainforests and deserts.
• The African Savannah is the most famous savannah in the world.
• It covers large parts of East and Central Africa, including areas of Tanzania, Uganda, and South Sudan.

Climate :

• The savannah has two main seasons: a wet season and a dry season.
• Seasonal rainfall affects the growth of grasses and other plants.
• It also influences the migration of animals.

Wildlife :

• The savannah is home to many wild animals.
• Important animals include elephants, lions, zebras, and giraffes.
• These animals depend on the grasses and waterholes for food and water.

Threats :

• Human activities are threatening the savannah ecosystem.
• Farming and deforestation are reducing natural habitats.
• Climate change is also affecting rainfall, vegetation, and wildlife.
• Protecting the savannah is important for conserving its plants and animals.

(iii) The River Nile :

The River Nile is one of the most important rivers in Africa. It is about 6,650 km long and is traditionally regarded as the longest river in the world.

Cradle of Civilization :

• The Nile and its basin were the cradle of ancient Egyptian civilization.
• The river provided water and fertile land for people to settle and develop agriculture.

Agriculture :

• The Nile provides water for irrigation in the dry regions of Africa.
• Its water helps make the surrounding land fertile.
• Important crops grown in the region include wheat, barley, flax, fruits, and vegetables.

Other Uses :

• The Nile provides drinking water to millions of people.
• It supports fishing and provides hydroelectric power.
• The river is also useful for transportation and trade.

Countries Along Its Course :

• The Nile flows generally northwards towards the Mediterranean Sea.
• It passes through or drains parts of countries such as Uganda, South Sudan, Sudan, and Egypt.

SOUTH AMERICA :

(i) The Andes Mountains :

The Andes Mountains are located along the western coast of South America. They are the largest mountain range in South America.

Famous Landforms :

• The Andes are home to Mount Aconcagua, the highest peak in the Western Hemisphere.
• Bolivia's Uyuni Salt Flats are also located in the Andes region.
• They are the largest salt flat in the world.

Water Supply :

• The Andes are an important source of freshwater for millions of people. They feed many major rivers.
• The Amazon River gets much of its water from the Andes and flows eastward.

Rich Wildlife :

• The Andes are home to thousands of species of mammals, birds, amphibians, reptiles, and fish. Many of these species are found nowhere else in the world.
• The Andean condor is an important symbol of the region.
• It has an average wingspan of about 3.2 metres and has great importance in local mythology.

Conservation :

• Human activities have greatly affected the natural environment of the Andes.
• Only about one-fourth of the original flora and fauna remains in some areas.
• Therefore, the Andes are an important conservation hotspot.

Mineral Resources :

• The Andes are rich in mineral resources. They contain large reserves of copper, zinc, silver, and lithium.
• These minerals are important for industries and the economies of several South American countries.

(ii) The Amazon Rainforest :

The Amazon Rainforest is a vast tropical forest supported by the Amazon River and its many tributaries. A rainforest is a forest with tall, mostly evergreen trees and heavy rainfall.

Amazon River :

• The Amazon Rainforest is nourished by the Amazon River.
• The river originates in the Andes Mountains of Peru and flows eastward into the Atlantic Ocean.
• It is the largest river in the world by volume of water.

“Lungs of the Earth” :

• The Amazon is often called the “Lungs of the Earth” because of its great importance to the global environment.
• It plays an important role in regulating the climate and carbon cycle.

Indigenous Communities :

• Nearly 400 Indigenous communities live in the Amazon Rainforest.
• These communities have traditional knowledge of the forest.
• They play an important role in protecting and conserving the rainforest.

Connection with the Sahara Desert :

• Dust from the Sahara Desert travels across the Atlantic Ocean to the Amazon.
• This dust contains phosphorus, an important nutrient for plant growth.
• Thus, the Sahara and Amazon are connected through a natural global ecological process.

Threats to the Rainforest :

• The Amazon Rainforest is increasingly threatened by deforestation and climate change.
• Forests are cleared for activities such as development and agriculture.
• Protecting the Amazon is important for wildlife, Indigenous communities, and the global environment.

(iii) The Atacama Desert (Chile) :

The Atacama Desert is located in Chile, South America. It is known as one of the driest places on Earth and stretches for about 1,000 km.

Climate :

• The Atacama has an extremely dry climate.
• It experiences large changes in temperature between day and night.
• Temperatures can reach about 40°C during the day and fall to around 5°C at night.

Unique Landscape :

• The desert has a rocky and unusual landscape.
• Its landforms are often compared to the surface of the Moon or Mars.
• NASA has used parts of the Atacama to test planetary rovers because of its Mars-like conditions.
• The desert has unique moon-like formations created by movements of the Earth's crust.
• Different minerals in the soil create striking colours across the landscape.

Clear Night Skies :

• The Atacama has some of the clearest skies in the world.
• Its dry climate and lack of clouds make it an excellent place for stargazing and astronomical research.

Famous Giant Hand :

• A famous sculpture called the “Hand of the Desert” stands in the desert.
• It is a giant human hand rising from the ground and reaching towards the sky.
• The sculpture was created by Chilean artist Mario Irarrázabal.

Environmental Crisis :

• The Atacama has become one of the world's major dumping grounds for discarded clothing.
• Large amounts of unwanted clothes are dumped there due to the growth of fast fashion.
• This waste creates serious environmental and social problems.

KEY TERM — Fast Fashion : Rapid, low-cost replication of trendy clothing, often produced with low-wage labour and quickly discarded. The Atacama Desert has become one of the world's fastest-growing dumping grounds for discarded clothes — the UN calls it 'an environmental and social emergency'.

NORTH AMERICA :

(i) The Colorado Plateau & Grand Canyon :

The Colorado Plateau and the Grand Canyon are located in the southwestern United States. They form a beautiful and geologically important highland region.

Formation and Landforms :

• The Colorado Plateau covers more than 3,30,000 square km. It is mainly made up of layers of sedimentary rocks.
• Over millions of years, tectonic forces slowly uplifted the rock layers.
• Erosion by rivers and wind carved the rocks into deep canyons and striking red-rock formations.

Colorado River :

• The Colorado River flows through the plateau. It has played an important role in carving the landscape.
• The river flows far below the high plateau, creating a dramatic difference in elevation.

Grand Canyon :

• The Grand Canyon is the most famous feature of the region.
• It is a spectacular natural landmark known for its great depth, colourful rocks, and huge size.
• It attracts about 5 million visitors each year.

Natural Resources :

• The region is rich in natural resources and minerals.
• Important resources include coal, oil, natural gas, uranium, and copper.
• These resources are valuable for energy and industries.

Plant Life :

• The unique environment supports a variety of plants.
• Both coniferous and deciduous trees are found in different parts of the region.
• The vegetation changes according to altitude, climate, and availability of water.

(ii) The Rocky Mountains ('The Rockies') :

The Rocky Mountains, commonly called the “Rockies,” are a vast mountain range in North America. They stretch for more than 4,800 km.

Mineral Resources and Economy :

• The Rockies are rich in minerals such as copper, gold, and silver.
• Important economic activities in the region include mining, hydropower generation, tourism, and agriculture.

Indigenous Communities :

• Until about 300 years ago, many Indigenous communities lived in the Rocky Mountains.
• They depended on the rivers, forests, and wildlife for food and other needs.
• They also considered the mountains sacred.
• Today, many of their descendants live on established reservations.

Yellowstone National Park :

• Yellowstone National Park is located in the Rocky Mountain region.
• It is famous for Old Faithful, a geyser that regularly erupts hot water and steam. The geyser's activity is linked to heat from deep inside the Earth.

Restoration of Ecological Balance :

• Yellowstone once had too many elk, which overgrazed the vegetation.
• In 1995, wolves were reintroduced into the park. The wolves reduced the elk population by hunting them.
• This allowed vegetation to grow again. As a result, the natural ecological balance of the park improved.

(iii) The Appalachian Mountains :

The Appalachian Mountains are located in North America. They are considered one of the oldest mountain ranges in the world.

Indigenous Communities :

• The fertile valleys, abundant wildlife, and natural routes helped Indigenous communities live and grow in the region.
• The mountains have great spiritual and cultural importance for the Indigenous people.
• The Cherokee are one of the Indigenous communities traditionally associated with the Appalachian Mountains.

Economic Importance :

• The Appalachians have played an important role in the economic development of the region.
• They have provided important natural resources for industries. Major resources include coal, timber, and natural gas.
• These resources have supported energy production and other industries.

Tourism and Renewable Energy :

• Today, tourism is an important activity in the Appalachian region.
• The mountains attract visitors because of their scenery, forests, and outdoor activities.
• Renewable energy is also becoming increasingly important in the region.

(iv) The Great Lakes :

The Great Lakes are a group of five large freshwater lakes located in North America.

Importance for Trade :

• The Great Lakes have been important for trade and industry for centuries.
• Their extensive waterways provide important shipping routes.
• They help transport goods and support industries in the surrounding region.

Source of Drinking Water :

• Many cities and communities around the Great Lakes depend on them for drinking water.
• The lakes provide a major source of freshwater for millions of people.

Wildlife :

• The Great Lakes provide a large and important habitat for many plants and animals.
• They support a wide variety of fish, birds, and other wildlife.

Environmental Threats :

• The Great Lakes face several serious environmental threats.
• Chemical contamination can affect the lake sediments and aquatic life. Agricultural run-off can carry harmful substances into the lakes.
• Industrial pollution can also reduce water quality.
• Protecting the Great Lakes is important for people, wildlife, and the environment.

AUSTRALIA :

Australia is known for its vast dry landscapes and beautiful marine ecosystems.

(i) The Great Australian Desert : 

A large part of Australia is arid or desert land, collectively called the Great Australian Desert. It includes several deserts, such as the Great Victoria Desert.

(a) Wildlife :

• The dry interior is home to many animals, including reptiles, skinks, wallabies, bilbies, and feral camels.
• Predators include dingoes, large lizards, cats, foxes, and snakes.
• Some rare native animals, such as the sandhill dunnart, marsupial mole, and mallee fowl, are facing threats to their survival.

(b) Feral Camels :

• Camels are not native to Australia. They were brought from places such as India and Afghanistan during the 19th century.
• They were used by explorers and settlers to travel through and map the desert.
• Today, many camels live wild in the Australian outback.

The Spinifex People :

• The Spinifex people are an Indigenous Australian community. They have lived in the Australian desert for more than 25,000 years.
• They have a rich culture and a unique traditional way of life.
• Younger generations continue to preserve their culture and traditions.
• Their heritage and connection with the desert are also of interest to visitors and tourists.

The Great Barrier Reef :

• The Great Barrier Reef lies off Australia's northeastern coast (see Oceans section)

DON'T MISS OUT — Cold Deserts 'Desert' does not always mean hot! Antarctica is the largest desert on Earth (over 14 million sq. km — more than 4 times the area of India) and also the coldest, even colder than the Arctic (the planet's other polar desert).

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