Domains of the Earth
Q18. What happened to Andaman
& Nicobar Islands during Tsunami?
Parts of Andaman & Nicobar islands were submerged under water during
Q19. How is
elevation of land measured?
Ans. Elevation of land is
measured from the level of the sea, which is taken as zero.
the major divisions of the earth’s surface.
Ans. The major divisions
of the earth’s surface are continents and ocean basins.
is considered as busiest ocean from the point of view of commerce?
Ans. The Atlantic Ocean is
considered as busiest ocean from the point of view of commerce.
Q22. What makes water of lakes and rivers unsuitable for human
Discharge of waste material into lakes and rivers makes the water unsuitable
for human use.
links North America to South America?
North America is linked to South America by a very narrow strip of land called
the Isthmus of Panama.
Q24. What is ‘Global
Increase in the amount of CO2 leads to increase in global
This is termed as global
are the major components of the Lithosphere?
It comprises the rocks of the earth’s crust and the thin layers of soil that
contain nutrient elements which sustain organisms.
Q26. Why the earth is called
a blue planet?
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.
Q27. What are the chief movements of the ocean water?
The chief movements of ocean waters are the waves, the tides and the ocean
Q28. Name the five major oceans of the world.
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.
Q29. Why do the climbers experience problems in breathing at
The climbers experience problems in breathing due to decrease in the density of
air at high altitudes.
Q31. What are the components of the Hydrosphere?
Running water in oceans and rivers and in lakes, ice in glaciers, underground
water and the water vapor in atmosphere, all comprise the hydrosphere.
Q32. What causes fast removal
of soil from slopes?
of forests for fulfilling our needs of wood, or clearing land for agriculture
causes fast removal of soil from slopes.
Q33. Write a short note on the continent - Australia.
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.
Q34. Name the different layers of the atmosphere.
The atmosphere is divided into five layers: troposphere, the stratosphere, the mesosphere,
the thermosphere and the exosphere.
two continents lie entirely in the Southern and Northern Hemisphere?
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.