Ans. Parts of Andaman & Nicobar islands were submerged under water during Tsunami.
Ans. Elevation of land is measured from the level of the sea, which is taken as zero.
Ans. The major divisions of the earth’s surface are continents and ocean basins.
Ans. The Atlantic Ocean is considered as busiest ocean from the point of view of commerce.
Ans. Discharge of waste material into lakes and rivers makes the water unsuitable for human use.
Ans. North America is linked to South America by a very narrow strip of land called the Isthmus of Panama.
Ans. Increase in the amount of CO2 leads to increase in global temperatures.
This is termed as global warming.
Ans. It comprises the rocks of the earth’s crust and the thin layers of soil that contain nutrient elements which sustain organisms.
Ans. The earth is called the blue planet because more than 71 percent of the earth is covered with water and 29 percent is with land.
Ans. The chief movements of ocean waters are the waves, the tides and the ocean currents.
Ans. The five major oceans are the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Southern Ocean and the Arctic Ocean, in order of their size.
Ans. The climbers experience problems in breathing due to decrease in the density of air at high altitudes.
Ans. Running water in oceans and rivers and in lakes, ice in glaciers, underground water and the water vapor in atmosphere, all comprise the hydrosphere.
Ans. Cutting of forests for fulfilling our needs of wood, or clearing land for agriculture causes fast removal of soil from slopes.
Ans. Australia is the smallest continent that lies entirely in the Southern Hemisphere. It is surrounded on all sides by the oceans and seas. It is called an island continent.
Ans. The atmosphere is divided into five layers: troposphere, the stratosphere, the mesosphere, the thermosphere and the exosphere.
Ans. Two continents lying entirely in northern hemisphere are North America and Europe. Two continents lying entirely in southern hemisphere are South America and Australia.
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