UNIT 8: WATER CYCLE

2. the effect of contaminants; surface water intensifies
6. water that is located below the earth's surface
8. The water vapor cools down and changes back into liquid water
10. A process when heat from the sun causes water to become a gas; rain, snow, sleet, or hail
11. Characteristics; pH of 6,5-9.2, doesn’t contain toxic substances, free from contaminants such as bacteria and parasites
13. The process when water is heated, it changes from a liquid to a gas called water vapor

1. A large container for collecting rain that can then be used to water plants
3. the journey of water takes as it circulates from the land to the sky and back again
4. the process by which a plant uses the energy from the light of the sun to produce its own food
5. Synonym: A way to keep and protect something from damage, change, or waste (noun)
7. the heat energy or source that controls the process of water cycle
9. The rain that harms trees and raises the acidity of lakes, making it difficult for fish to live in them
11. The formation of water vapor when it becomes cooler as it rises and condenses into tiny drops
12. a wall built across a river that stops the river's flow and collects the water, especially to make a reservoir