Solar radiation is the only primary source of light and heat on the earth. But only 51% of solar energy reaches the earth. What would happen if the entire solar energy reaches the earth? Give reasons to support your answer.

If the entire solar energy reached the Earth instead of only 51%, the Earth would become excessively hot. The consequences would include:

1. Rise in Temperature — The Earth's temperature would increase drastically, making the climate extremely hot.

2. Melting of Ice Caps and Glaciers — Increased temperatures would melt polar ice, causing a rise in sea level.

3. Disturbed Heat Balance — The balance between incoming solar radiation and outgoing terrestrial radiation would be upset.

4. Changes in Climate and Rainfall — Weather patterns would become irregular, leading to more droughts, floods, and extreme weather.

5. Adverse Effects on Plants, Animals, and Humans — Excessive heat would affect agriculture, ecosystems, and human health.

Thus, only about 51% of solar energy reaching the Earth's surface helps maintain the heat balance necessary for life.