| A | B |
|---|
| body of water | Surface water that has collected in a lake, river, stream, or other area. |
| dissolve | When a solid, such as a salt, mixes with and becomes part of a liquid, such as water. |
| fresh water | Water with little or no salt dissolved init. Found in rivers, streams, and most lakes. |
| salt water | Water with salt dissolved in it. |
| surface water | Liquid water on the surface of the earth, not underground or in the air. |
| aquifer | A porous undergorund layer of rock, sand, or soil in which water is stored. |
| gravity | The downward pull on all objects toward the center of the earth. |
| groundwater | Water that is stored in porous layers beneath the earth's surface. |
| percolate | To move slowly down through the earth's layers. |
| porous | Having many small spaces or holes. |
| glacier | A large, long-lasting mass of moving ice and snow. |
| glacial meltwater | Water that flows out from the front (downhill) edge of a melting glacier. |
| iceberg | A chunk of ice that breaks off from a glacier flowing into the sea. |
| polar ice cap | The thick layers of ice covering the North and South Poles. |
| sea ice | A layer of ice formed when seawater freezes. In some places, like the North Pole, this ice is frozen all year. Also called "pack ice." This ice is NOT considered part of Earth's frozen water; it is part of Earth's surface water. |
| air | A mixture of gases that surround the earth. |
| cloud | A mixture of tiny particles of water, dust, and sometimes ice, floating in the air. |
| condensation | The change of a gas into a liquid when the gas is cooled. |
| evaporation | The process of a liquid changing into an invisible gas. |
| water vapor | The state (form) of water when it is an invisible gas. |
