ICSE Class 9 Answered

Earth does not absorb all the heat that is radiated by the sun. The balance maintained between the incoming solar radiation absorbed by the earth and the heat that escapes from the earth into the space is known as the heat budget. Following is the heat budget of the earth:

• Out of 100 units of heat that is radiated by the sun, 35 units of heat are reflected into the space by the layers of atmosphere.
• 14 units are absorbed by the Ozone layer.
• Rest 51 units are received by the earth.
• Out of 51 units, 34 units are absorbed by the earth, and sent back into the atmosphere.
• Rest 17 units are radiated directly into the space by the earth.