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2) Explain in detail the processes through which the earth-atmosphere system maintains heat balance. (250 words)

Topic: Salient features of world’s physical geography. Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc.,

2) Explain in detail the processes through which the earth-atmosphere system maintains heat balance. (250 words)

Physical geography NCERT class XI

Why this question:

The question is based on the concept of Earth’s heat budget.

Key demand of the question:

One has to explain the concept in detail with necessary diagrams.

Directive:

Explain – Clarify the topic by giving a detailed account as to how and why it occurred, or what is the particular context. You must be defining key terms where ever appropriate, and substantiate with relevant associated facts.

Structure of the answer:

Introduction: 

Define the concept of heat budget in brief.

Body:

The sun is the ultimate energy source for the entire universe. Though the sun is continuously radiating energy, the earth as a whole does not accumulate or lose heat. It maintains its temperature. This is popularly known as heat budget or heat balance of the earth.

This can happen only if the amount of heat received in the form of insulation is equal to the amount lost by the earth in the form of terrestrial radiation. 

Briefly explain the different ways of heating and cooling of the atmosphere.

Conclusion:

Conclude by highlighting the application of the concept in day to day life on Earth.