There are 1.2 1021 liters of water on Earth. Why do we need to ...

[Engineer]

There are 1.2  1021 liters of water on Earth. Why do we need to conserve water?
 
  A) Only an incredibly tiny amount of that water is usable.
  B) The growing population of the earth means more water is need each day.
  C) Many of the water sources are shared.
  D) Water has many different uses.
  E) all of the above

Question 2

The upper boundary of an underground zone of saturated water is called ________.
 
  A) the aquifer
  B) the subterranean surface
  C) the surface recharge
  D) the water table

[aloop]

Answer to Question 1

E

Answer to Question 2

D

[Engineer]

Excellent

[FergA]

Gracias!