a. One
	b. Fifty
	c. Three

2. The human brain is

	a. 10% water
	b. 99% water
	c.75% water

3. How much of the earthÕs water can be used by people?

	a. Most of it - 97%. 2% is ocean water, which is too salty to drink, and 1% is frozen in the icecaps and glaciers of the north and south poles.
	b. Half can be used - 50%. 35% is ocean water, and 15% is frozen.
	c. Only 1% of the worldÕs water can be used by human beings. 97% is salty ocean water and 2% is frozen.

4. A person can live for about a month without food. How long can a person live without water

	a. Up to one week
	b. Up to one day
	c. Up to one month

5. If one inch of rain fell into a reservoir one acre in size, how much water would be collected?

	a. Enough to fill an olympic size swimming pool
	b. Enough to fill a movie theater
	c. Enough to fill a schoolbus

6. How much water does the average person use each day?

	a. In the United States, 50 gallons, and in Israel, 50 gallons
	b. In the United States 100 gallons, in Israel, 25 gallons
	c. 50 gallons in the United States, and 100 gallons in Israel

7. What part of the earthÕs surface is ocean?

	a. Only 5%, most of it is land
	b. About 50%, or half
	c. Most of it - about 71%

8. Why is water necessary to the earth?

	a. It regulates the earthÕs temperature
	b. ItÕs necessary for all life on the planet
	c. All of the above