Case Study-Oceans and Continents-Class 6-Social Science

Chapter 2- Oceans and Continents-Subject Social Science-Class 6-Case Study based Question Answers

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Case Study 1: Why is the Earth Called the Blue Planet?

Aman and Riya were watching a space documentary when they saw an image of Earth from space. Riya noticed that most of the Earth appeared blue and asked her teacher why. Their teacher explained that about 71% of the Earth's surface is covered by water, mainly in the form of oceans, seas, rivers, and lakes. The vast oceans make the Earth look blue from space, which is why astronauts call it the "Blue Planet." However, most of this water is salty and unsuitable for drinking. Only a small percentage of the Earth's water is freshwater, found in rivers, lakes, and glaciers.

Questions & Answers:

Why is the Earth called the "Blue Planet"?
Answer: Because about 71% of its surface is covered by water, making it look blue from space.
What type of water is most commonly found on Earth?
Answer: Saltwater in oceans and seas.
Where can we find freshwater on Earth?
Answer: In rivers, lakes, glaciers, and underground water sources.
MCQ: What percentage of the Earth's surface is covered by water?
a) 50%
b) 71%
c) 85%
d) 90%
Answer: b) 71%
MCQ: Which of the following water sources contains freshwater?
a) Ocean
b) Sea
c) River
d) Bay
Answer: c) River

Case Study 2: The Five Oceans of the World

During geography class, the teacher asked students to name the five oceans of the world. Meera confidently answered: Pacific Ocean, Atlantic Ocean, Indian Ocean, Arctic Ocean, and Southern Ocean. The teacher explained that the Pacific Ocean is the largest, while the Arctic Ocean is the smallest. The Indian Ocean is known for being the warmest, while the Atlantic Ocean is famous for its busy trade routes. The Southern Ocean surrounds Antarctica. Meera was amazed to learn that all these oceans are connected and constantly moving, forming a global water system.

Questions & Answers:

How many oceans are there on Earth?
Answer: There are five oceans on Earth.
Which is the largest ocean?
Answer: The Pacific Ocean is the largest.
Why is the Indian Ocean important?
Answer: The Indian Ocean is the warmest and plays a key role in trade and monsoons.
MCQ: Which ocean is the smallest?
a) Pacific Ocean
b) Atlantic Ocean
c) Arctic Ocean
d) Southern Ocean
Answer: c) Arctic Ocean
MCQ: Which ocean surrounds Antarctica?
a) Indian Ocean
b) Pacific Ocean
c) Southern Ocean
d) Atlantic Ocean
Answer: c) Southern Ocean

Case Study 3: The Seven Continents

During a classroom discussion, the teacher asked students to identify the seven continents on a world map. Rohit pointed out Asia, Africa, North America, South America, Antarctica, Europe, and Australia. The teacher explained that Asia is the largest continent, while Australia is the smallest. Antarctica is covered with ice and has no permanent human population. Africa has the most number of countries, and North and South America are separated by the Panama Canal. The students were excited to learn how different continents have unique landscapes and cultures.

Questions & Answers:

How many continents are there on Earth?
Answer: There are seven continents on Earth.
Which is the largest continent?
Answer: Asia is the largest continent.
Which continent has the most number of countries?
Answer: Africa has the most countries.
MCQ: Which continent is the smallest?
a) Antarctica
b) Australia
c) Europe
d) South America
Answer: b) Australia
MCQ: Which continent is mostly covered in ice?
a) Africa
b) Europe
c) Antarctica
d) Asia
Answer: c) Antarctica

Case Study 4: How Oceans Affect Climate

During summer vacation, Anaya visited her grandparents who lived near the coast. She noticed that the weather there was cooler than in the city. Her grandfather explained that oceans help regulate temperature by absorbing heat during the day and releasing it at night. This keeps coastal areas cooler in summer and warmer in winter. He also told her about the monsoon winds, which bring rainfall to India. Anaya was amazed to learn that oceans play a major role in controlling the climate of the Earth.

Questions & Answers:

Why do coastal areas have moderate temperatures?
Answer: Because oceans absorb and release heat slowly, keeping temperatures stable.
What role do oceans play in monsoons?
Answer: Oceans help in forming monsoon winds, which bring rainfall to many regions.
Why is ocean water always moving?
Answer: Due to winds, tides, and ocean currents.
MCQ: Which factor helps oceans regulate climate?
a) The movement of fish
b) The sun’s heat absorption by water
c) The color of the water
d) The size of the ocean
Answer: b) The sun’s heat absorption by water
MCQ: What causes ocean waves?
a) Wind
b) Trees
c) Earthquakes
d) Icebergs
Answer: a) Wind

Case Study 5: 2004 -Tsunami and Disaster Management

“ On 26 December 2004, India and another 13 countries around the Indian Ocean were struck by a powerful tsunami caused by an earthquake in Indonesia. More than two lakh people lost their lives. In India, the Andaman and Nicobar Islands (see Fig. 2.4 above, and also the subsection ‘Islands’ further below) and the coasts of Tamil Nadu and Kerala were severely affected and suffered much damage and loss of life.

“ Such tsunamis are rare but very destructive. Luckily, they can often be detected before they hit a coast. Many countries collaborate in such ‘early warning systems’. There is, in particular, an Indian Ocean Tsunami Warning System, to which many countries, including India, contribute. This helps to take measures to protect lives and property.

“ Events that lead to loss of life and property are handled under disaster management. India has its own ‘National Disaster Management Authority’ to deal with all kinds of disasters.

What was the main cause of the tsunami that struck India on 26 December 2004?
a) A volcanic eruption in the Indian Ocean
b) A cyclone near the Bay of Bengal
c) An earthquake in Indonesia
d) A flood in the Andaman and Nicobar Islands
✔ Answer: c) An earthquake in Indonesia
Which Indian regions were most affected by the 2004 tsunami?
a) Rajasthan and Gujarat
b) Andaman and Nicobar Islands, Tamil Nadu, and Kerala
c) Punjab and Haryana
d) Madhya Pradesh and Chhattisgarh
✔ Answer: b) Andaman and Nicobar Islands, Tamil Nadu, and Kerala
What is the purpose of the Indian Ocean Tsunami Warning System?
a) To predict earthquakes in the Himalayas
b) To monitor rain patterns for better farming
c) To detect tsunamis before they reach the coast
d) To prevent cyclones in the Bay of Bengal
✔ Answer: c) To detect tsunamis before they reach the coast
Which organization in India handles disaster management?
a) Indian Space Research Organisation (ISRO)
b) National Disaster Management Authority (NDMA)
c) Geological Survey of India (GSI)
d) Central Pollution Control Board (CPCB)
✔ Answer: b) National Disaster Management Authority (NDMA)
How do early warning systems help in case of a tsunami?
a) They stop the tsunami from occurring
b) They help evacuate people and reduce loss of life
c) They prevent earthquakes from happening
d) They increase the water levels to reduce damage
✔ Answer: b) They help evacuate people and reduce loss of life

Case Study 6: The Importance of Oceans for Humans

During a school trip, Vikram and his classmates visited a marine research center. The guide explained that oceans are essential for human life. They provide food, oxygen, jobs, and transportation. Fishermen catch fish for people to eat, while ships transport goods across the world. The students also learned about ocean pollution, which harms marine animals. Vikram realized that protecting oceans is important for the survival of both humans and sea creatures.

Questions & Answers:

How do oceans provide food for humans?
Answer: Fishermen catch fish and seafood, which is an important food source.
How do oceans help in transportation?
Answer: Ships use oceans to transport goods between countries.
What is a major problem affecting oceans today?
Answer: Ocean pollution, especially from plastic waste.
MCQ: Which industry depends the most on oceans?
a) Farming
b) Fishing
c) Mining
d) Banking
Answer: b) Fishing
MCQ: What is the biggest cause of ocean pollution?
a) Plastic waste
b) Clean water
c) Plants
d) Sunshine
Answer: a) Plastic waste