Point 8 of 19 — Module 1 — The Hydrosphere on Planet Earth and the Water Cycle in NatureQuestion bank: 0 questions (0 with pictures)
08 2.2 The energy source
Two forces drive the cycle: solar energy, which provides the heat to evaporate water and drives winds, and gravity, which pulls rain, snow and runoff down to lower levels.
Without the Sun the cycle would stop within days; without gravity there would be no rain falling and no rivers flowing.
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