NCERT Solutions class 6 Social-Science Chapter 2. Oceans and Continents Chapter Reviews

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Chapter 2 — Oceans and Continents (Keypoints)

Quick review: Short, exam-friendly keypoints summarising the main ideas of the chapter.

• Earth’s surface: Covered mostly by water (about three-fourths); land occupies a little over one-fourth.
• Oceans: Large bodies of salt water; five commonly listed oceans are the Pacific, Atlantic, Indian, Arctic and Southern.
• Largest ocean: The Pacific Ocean is the largest and deepest.
• Indian Ocean: Lies south of Asia; Arabian Sea to the west of India and Bay of Bengal to the east.
• Oceans are connected: Boundaries on maps are conventional — water flows continuously between oceans.
• Marine life: Oceans support diverse flora (algae, seaweeds) and fauna (fish, whales, dolphins, corals).
• Freshwater vs seawater: Most of Earth’s water is salty; freshwater (rivers, lakes, glaciers, groundwater) is limited and precious.
• Oceans & climate: Oceans influence rainfall, weather systems and climate (e.g., monsoon rains originate over oceans).
• Disasters from oceans: Storms, cyclones and tsunamis originate in the ocean and can cause severe coastal damage.
• Continents: Large landmasses; commonly counted as seven — Asia, Africa, North America, South America, Antarctica, Europe, Australia.
• Continent counts vary: Depending on criteria, continents may be listed as four to seven (e.g., Eurasia = Europe + Asia).
• Largest & smallest continents: Asia is the largest by area and population; Australia is the smallest (often called an island-continent).
• Islands: Land surrounded by water; Greenland is the world’s largest island. India has many islands (Andaman & Nicobar, Lakshadweep).
• Oceans and human life: Oceans have shaped migration, trade, food (fishing), culture and scientific research (e.g., Indian Antarctic programme).
• Environmental concerns: Oceans face pollution (plastic, industrial waste) and overfishing — protecting marine environments is vital.
• Role of oceans in oxygen production: Marine plants (phytoplankton, algae) contribute a large share of global oxygen — oceans act like the “lungs” of the planet.
• Distribution difference: Northern Hemisphere has more land; Southern Hemisphere has more ocean area.
• Practical activities: Draw the continents freehand, label oceans on a world map, and compare relative sizes (use the chapter diagrams).
• Important dates: World Oceans Day — June 8 (UN) to remind us of the ocean’s role and need for protection).
• Summary line: Oceans and continents together shape climate, life and human activity — and require collective protection for future sustainability.