NCERT 6th Class (CBSE) Social Science: Major Domains of the Earth

Question: What percent of the earth is covered with water?

Answer: More than 71 per cent of the earth is covered with water.

Question: What percent of earth is covered with land?

Answer: 29 per cent of earth is covered with land.

Question: How much of the earth’s water is found in the oceans?

Answer: More than 97 percent of the earth’s water is found in the ocean.

Question: Why is the ocean water not fit for human use?

Answer: It is because the ocean water is very salty.

Question: Why do the mountaineers carry with them oxygen cylinders?

Answer: The mountaineers carry with them oxygen cylinders so that they can easily breathe at high altitudes.

Question: What is the nature of the temperature?

Answer: The temperature decreases as we go upwards.

Question: Name the continents that surround the pacific ocean.

Answer: Asia, Australia, North America and South America.

Question: Which is the busiest ocean from the point of view of commerce?

Answer: The Atlantic ocean is the busiest ocean from the point of view of commerce.

Question: Mention two reasons of fast removal of soil from stops.

Answer:

1. Cutting of forests for wood.
2. Clearing land for agriculture.

Question: What happened to Andaman and Nicobar islands during Tsunami?

Answer: Parts of these islands were submerged under water during Tsunami.

Question: What makes the water of lakes and rivers unsuitable for human use?

Answer: Discharge of waste material into lakes and rivers makes the water unsuitable for human use.

Question: Mention any two reasons of air pollution.

Answer:

1. Emission from industries
2. Emission from vehicles.