| A | B |
| Water Cycle | The movement of water from the ocean , to the air, to the land, and back |
| Ground Water | Water that soaks into the soil |
| Runoff | Water that flows over the ground and returns to the ocean |
| Freshwater | Water that does not contain salt |
| Water Table | The top layer of underground water |
| Spring | A place where underground water flows out of the ground |
| Tributary | A stream or river that flows into a larger river |
| Meanders | Bends in a stream or river |
| Flood plain | Low, flat area along the banks of a river |
| Lake | Large body of fresh water |