Take the quiz:

1) True or false: Most fresh water is contained in glaciers and polar ice.

True

False

Clear selection

2) How much of the Earth is covered in water?

nearly 65%

over three-fourths

about seven-tenths

73%

Clear selection

3) True or false: there is more freshwater in lakes and rivers than what is underground.

True

False

Clear selection

4) True or false: According to a 2008 study, there is a 50% chance that Lake Mead could run dry within five years.

True

False

Clear selection

5) Lake Mead is the largest _________ in the United States.