| A | B |
|---|
| The land area that supplies water to a river system. | watershed |
| The ridge of land that separates one watershed from another. | divide |
| A lake that stores water for human use. | reservoir |
| Three common types of this are bogs, marshes and swamps. | freshwater wetlands |
| These are big and deep. light does not reach the bottom. | lakes |
| Water that fills the cracks and spaces in underground soil and rock layers. | groundwater |
| Streams and smaller rivers that feed into a main river. | tributaries |
| Any form of water that falls from the clouds and reaches Earth's surface. | precipitation |
| The process by which molecules of water vapor in the air become liquid water when it cools. | condensation |
| The process by which water molecules in liquid water escape into the air as water vapor. | evaporation |
| This is made up of a river and all of its tributaries. | river system |
| The continuous process by which water moves from the Earth's surface to the atmosphere and back. | water cycle |
| These act as natural water filters. | wetlands |
| 97% of Earth's water is this. | saltwater |
| The place where an organism lives and obtains all the things it needs to survive. | habitat |
| Water that flows over the ground surface rather than soaking into the ground. | runoff |
| 3% of earth's water is this. | freshwater |
