| A | B |
|---|
| desalination | getting fresh water from sea water |
| water cycle | the continuous movement of water between Earth's surface and the air, changing from liquid to gas to liqui |
| groundwater | precipitation that seeps into the ground and is stored in tiny holes, or pores, in soil and rocks |
| water table | the top of the water-filled space in the ground |
| aquifer | an underground layer of rock or soil filled with water |
| spring | a place where groundwater seeps out of the ground. |
| well | a hole dug below the water table that water seeps into |
| reservoir | a storage area for fresh water supplies |
| basin | The floor of an ocean, containing mountains, valleys, and plains |
| current | an ocean movement; a large stream of water that flows in the ocean |
| continental shelf | the underwater edge of a continent |
| continental slope | the steep slope leading down from the continental shelf to the sea floor. |
| continental rise | a buildup of sediment on the sea floor at the bottom of the continental slope. It is a zone of sand, and mud, that stretches from the slope down to the deep-sea floor |
| abyssal plain | the vast flat lands beyond the continental shelf that cover almost half of the deep ocean floor. |
| seamount | a huge underwater volcanic mountain that may emerge from the ocean surface as an island |
| trench | a deep valley in the sea floor. |
| mid-ocean ridge | chain of mountains that wind along all the Earth's major oceans |
