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Continuous cycling of water among its three forms keeps the total water on earth:

AFalling
BFrozen
CConstant
DRising
Answer & Solution
Correct answer: C. Constant
1. Water exists as solid, liquid and gas. 2. The water cycle keeps the total constant. 3. Yet usable water can still run short. _Source: syllabus Science, Chapter 16, Water: A Precious Resource._
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