CLASS 6 SOCIAL SCIENCE · CHAPTER 2 · STUDY NOTES
Oceans and Continents
Read real maps, compare Earth’s land and water, and connect the ocean with everyday life.
01 / EXPLORE & UNDERSTAND
Why does Earth look blue?
Most of Earth’s surface is covered by ocean. Land occupies a smaller share.
Read the Earth photograph
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1. Separate water, land and clouds
In the Earth photograph, blue areas show water, land has several colours, and many white swirls are clouds. A white patch near a pole may also be ice. Colour is a clue that needs the location and context.
2. A view is not the whole surface
A photograph shows only one side of Earth. Rotate a globe or compare more views before judging the whole planet. Overall, water covers much more of Earth’s surface than land does.
Your turn
Question
A photograph shows mostly ocean. Does it prove there is almost no land on the other side?
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02 / EXPLORE & UNDERSTAND
The two hemispheres have different shares
The Equator divides Earth into northern and southern halves. Land is not shared equally between them.
Look down from each pole
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1. Read the polar views
The North Pole is at the centre of the northern view; the South Pole is at the centre of the southern view. The circles are parallels of latitude, while meridians meet at the pole. These are the same Earth lines viewed from a different angle.
2. Compare water with water
The Southern Hemisphere has a greater proportion of ocean. The Northern Hemisphere contains more land than the Southern Hemisphere, but that does not mean the Northern Hemisphere is mostly land.
Your turn
Question
Explain the difference between “more land than the south” and “more land than water”.
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03 / EXPLORE & UNDERSTAND
Five names, one connected ocean
The names help us locate regions. They are not walls in the water.
Follow the Pacific across the page edge
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1. Follow the water across the map
The five named oceans are Pacific, Atlantic, Indian, Southern and Arctic. Their boundaries are conventions used on maps. Seawater and marine organisms can move across these boundaries.
2. Use neighbours to remember locations
The Atlantic lies between the Americas and Europe–Africa. The Pacific lies between the Americas and Asia–Australia. The Indian Ocean lies south of Asia. The Arctic surrounds the North Pole; the Southern Ocean surrounds Antarctica.
3. Read size and map edges carefully
From largest to smallest, the usual order is Pacific, Atlantic, Indian, Southern, Arctic. The Pacific appears on both edges of this flat map because the map cuts a round world there; it is not two different oceans.
Your turn
Question
A ship crosses a drawn boundary from one named ocean to another. Has it crossed a land barrier?
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04 / EXPLORE & UNDERSTAND
Locate the waters around India
Use east and west on the map before memorising names.
Locate the seas on either side of India
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1. Start from India’s coasts
The Arabian Sea lies west of India. The Bay of Bengal lies east of India. Both are parts of the Indian Ocean, which extends southward from India.
2. Place the island groups in their waters
Lakshadweep is in the Arabian Sea. The Andaman and Nicobar Islands are in the Bay of Bengal. An island group is not one continuous piece of land; water separates individual islands.
Your turn
Question
A learner places Lakshadweep beside India’s east coast. Which map clue would help correct this?
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05 / EXPLORE & UNDERSTAND
Plenty of water is not plenty of drinking water
Most of Earth’s water is salty ocean water. Freshwater is a much smaller share.
1. Locate freshwater stores
Freshwater is found in glaciers, rivers, lakes and underground. Some is frozen or difficult to reach. Water in a store is not the same as clean water available at a tap when people need it.
2. Protect what people can use
Leaks, pollution and waste reduce usable supplies. Fixing leaks and using water carefully can help. The ocean’s large size does not remove the need to protect local freshwater sources.
Your turn
Question
Why can a coastal town face a freshwater shortage even with the sea beside it?
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06 / EXPLORE & UNDERSTAND
Why do books sometimes count continents differently?
A count depends on the grouping convention. The land does not change when the convention changes.
Compare area, not coastline shape
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1. Learn the seven-continent convention
The common school list is Asia, Africa, North America, South America, Antarctica, Europe and Australia. Asia is the largest and Australia the smallest in this convention.
2. Explain an alternative count
Europe and Asia share a continuous landmass, so some systems combine them as Eurasia. Some combine the Americas. This chapter’s world map labels Eurasia, while its comparison diagram separates Europe and Asia. Read the convention before counting.
3. Area is not outline
The square diagram compares approximate areas, not real shapes or positions. In the seven-continent comparison the order is Asia, Africa, North America, South America, Antarctica, Europe, Australia from largest to smallest.
Your turn
Question
One map labels Eurasia and another labels Europe and Asia separately. Must one map show a new landmass?
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07 / EXPLORE & UNDERSTAND
An island is land surrounded by water
Size and the chosen continental convention help distinguish islands from continents.
Two island groups, two sides of India
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1. Do not call Australia the largest island
In the convention used here, Australia is a continent. Greenland is the largest island. Both are surrounded by water, so that feature alone does not settle the category.
2. Antarctica is a continent with ice on it
Antarctica has a landmass beneath its ice. The Arctic is an ocean around the North Pole. Do not swap them just because both polar regions are cold. The book also introduces Indian scientific research in Antarctica.
Your turn
Question
A learner calls the Arctic a continent because it looks white on a picture. What distinction is missing?
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08 / EXPLORE & UNDERSTAND
The ocean connects to life on land
Ocean life ranges from tiny organisms near the surface to large animals and deep-sea creatures.
An ocean is a living habitat
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1. Follow water into the air
Water evaporates from the ocean. Water vapour can later condense into clouds, and rain can fall over land. This is an important connection in the water cycle; water also evaporates from land and freshwater.
2. Connect tiny life with a big role
Photosynthetic organisms in the ocean produce a large share of Earth’s oxygen. Marine life also consumes oxygen, so production is not the same as oxygen added to the air. Oceans also store and move heat, helping shape climate.
3. People depend on the sea too
Fishing, travel and trade connect people with oceans. Coastal stories and traditions reflect both benefits and dangers. Protecting ocean life also supports people whose lives and work depend on it.
Your turn
Question
How could a farm far from the coast still be connected to the ocean?
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09 / EXPLORE & UNDERSTAND
A cyclone and a tsunami are different events
Both can damage coasts, but they do not start in the same way.
1. Distinguish wind from moving water
A cyclone is an intense storm with powerful winds and rain. A tsunami often begins when an undersea earthquake displaces water. Not every earthquake causes a tsunami, and an ordinary windy day does not explain one.
2. Understand why warning systems matter
The chapter describes the destructive Indian Ocean tsunami of 26 December 2004. Monitoring, warnings and planned responses help communities prepare. Warnings are useful when people can understand them and act on official local instructions.
Your turn
Question
Why would studying winds alone be insufficient for a tsunami warning system?
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10 / EXPLORE & UNDERSTAND
Protect the connected ocean
A boundary drawn on a map does not stop pollution or protect living things by itself.
1. Trace the effects of waste
Plastic and other pollution can harm marine organisms and habitats. Waste thrown on land can travel through drains and rivers to the sea. Prevention begins before it reaches the coast.
2. Care needs individual and shared action
Avoid litter, reduce unnecessary waste and support proper collection. Protecting habitats and managing fishing also require communities and public institutions. World Oceans Day on 8 June draws attention to these shared responsibilities.
Your turn
Question
Why is an inland school’s waste collection relevant to ocean protection?
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Take these ideas with you
- Earth has more ocean than land, but a photograph shows only one view.
- Five named oceans are connected. Pacific appears on both edges of many world maps.
- The Arctic is an ocean; Antarctica is a continent.
- Arabian Sea is west of India; Bay of Bengal is east.
- Continent counts depend on the grouping convention.
- Oceans support life, rainfall and livelihoods. Pollution and overfishing can harm them.
Use your understanding in a new situation
Question
A student calls Antarctica the smallest ocean. Repair both parts of that statement.
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Why can one map show six continents and another seven without land physically moving?
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