Question

9. Three percent of the world’s water resources are found as a. fresh water. c. icecaps and glaciers. b. salt water. d. groundwater. _____ 10. Most of the pollutants in the ocean come from a. commercial boats and personal watercraft. b. spills from oil tankers. c. activities on land. d. leaking underground storage facilities. _____ 11. The largest watershed in the United States is the a. Mississippi River. c. Colorado River. b. Yukon River. d. Rio Grande. _____ 12. During the water treatment process, what is the purpose of adding chlorine to water? a. to remove large debris b. to form flocs c. to kill or limit bacterial growth d. to remove unwanted gases

Answer 1

Answer:

9. c

10. c

11. a

11.c

Explanation:

97% of the world's water resources are found in salt water.

3% are found in  icecaps and glaciers

The Mississippi River watershed is the largest in America with an area of 3.2 million square kilometers. it is the fourth largest in the world. It covers about 40% of the continental landmass of the US