Answer:
0.3 %
Explanation:
Earth cleans and replenishes the water supply through the hydrologic cycle. The earth has an abundance of water, but unfortunately, only a small percentage, is even usable by people.
<span>Basically, the variable n is equal to the amount of P out of the system divided by the about of P into the system
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Gravity affet everything and it touches nothing.
Hope this helps!