The main source of energy on the Earth is:
ASolar radiation
BOcean currents
CEarth rotation
DWind movement
Answer & Solution
Correct answer: A. Solar radiation
1. Winds, currents and the water cycle all need a driver.
2. That driver reaches the Earth from outside it.
3. Solar radiation is the main source of energy on the Earth.
4. So the answer is solar radiation.
_Source: NCERT Class 9 Science, Ch 13 'Earth as a System: Energy, Matter, and Life'_
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