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How much of the Earth’s land surface is desert?
Man can maintain an ecological balance in the biosphere by:
The temperature increases rapidly above:
Tropical storm in Chinese Sea is known as–
As one moves from the polar region towards equator the diversity of plant and animal species .
What percentage of world’s freshwater is stored as glacial ice?
Which one of the following does not cause soil erosion?
Stars twinkle but planets do not twinkle because:
Which of the following winds is called anti-trade wind?
The layer where the decrease in temperature with increasing altitude is totally absent is: