Water
1. Many organisms in water ecosystems exchange gases with the ______.
A. sand and soil B. soil and air
C. air and water D. water and soil
C. air and water
2. What covers most of the earth and is large enough to contain many ecosystems?
A. tundras B. grasslands
C. deserts D. oceans
D. oceans
3. Where is groundwater found?
in and under the ground
4. Even though millions of humans and other organisms live on land, most of Earth's surface is actually made up of ______.
oceans
5. Almost all of Earth's surface is covered by what type of water?
Salt water
6. Earth's surface as a fraction is how much water and how much land?
3/4 water, and 1/4 land
7. If sewage leaks into the local river, the river is now ______.
A. polluted B. safe for swimming
C. endangered D. more healthy
A. polluted
8. Most households waste at least some water. Which of the following is NOT a practical way for people to conserve water at home?
A. Run dishwashers and washing machines only when they are full.
B. Drink less water, and substitute juice, soda, or milk instead.
C. Locate and fix any leaky pipes.
D. Take shorter showers.
B. Drink less water, and substitute juice, soda, or milk instead.
9. The difference between renewable and nonrenewable resources is that __________.
renewable resources will not run out if used wisely, but nonrenewable resources will someday run out
10. What advantage does wind and solar have over coal and oil? Wind and solar are _________; coal and oil __________.
Wind and solar are renewable; coal and oil are not.
11. Which of these natural resources takes the longest to be replaced?
A. crops B. sunlight
C. coal D. trees
C. coal
12. What can we do to help conserve resources?
(Hint...3 R's)
Reduce, Reuse, Recycle
13. How does chemical fertilizer pollution used on land end up in the oceans?
It is carried in precipitation runoff and rivers.
14. Most of the fresh water on Earth is _______.
Frozen
15. What percentage of Earth’s water is NOT salt water?
3%
16. Why is it important to protect the Earth’s fresh water resources?
Fresh water is needed for plants and animals to survive, supports biodiversity, fuels economies, and can be polluted easily.