India Exam Junction
[PPSC PRINCIPAL, ITI (WOMEN) 2024]
23. Clouds and the atmosphere, and, to a lesser extent, surfaces (especially snow, ice, and the ocean) reflect about _______ of the solar radiation (also called insolation) that falls on Earth, while the remaining ______ of the solar radiation that falls on Earth is absorbed and drives the hydrologic cycle and other biogeochemical cycles; produces our climate, and powers almost all life through the process of photosynthesis.
30%; 70%
50%; 50%
10%; 90%
90%; 10%
Correct Answer :
30%; 70%
Solution
- About 30% of the solar radiation that reaches Earth is reflected back into space by clouds, the atmosphere, and surfaces like snow and ice.
- The remaining 70% is absorbed by the Earth's surface, atmosphere, and oceans. This absorbed energy drives the hydrologic and biogeochemical cycles, produces Earth's climate, and powers life through processes like photosynthesis.