Global
Cycles: The Hydrologic Cycle
Clearly, water is essential for life (its a required reactant
for the photosynthesis that produces oxygen and carbohydrates) but ....
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What process are required in order for rainfall to occur?
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What role does rainfall play in global climate? Is it merely
a source of fresh water?
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Can human activity influence the global hydrologic cycle?
(prerequisite: understanding phase transitions)
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Note, its election day. Here are the endorsements
of the Sierra Club.