| A | B |
|---|
| precipitation | rain, snow, sleet, or hail |
| sleet | small bits of ice formed by raindrops that freeze or by partly melted snowflakes freezing again |
| hail | frozen drops of rain that fall as lumps of ice |
| hydrologic cycle | water cycle |
| condensation | the change of gas into a liquid when it is cooled |
| evaporation | change from a liquid to a gas, liquids evaporate faster when heated |
| runoff | water from rain, or melted snow that flows into a river, lake, or ocean |
| meander | curves or bends in a river, formed by fast moving channels of deep water |
| drainage basin | area that a stream drains |
| groundwater | water trapped in holes and cracks in rocks beneath the earth's surface |
| spring | a small stream of water coming from the earth |
| acid rain | rain polluted by acids, gases released from cars, factories, and power plants combine with moisture in the atmosphere |
| water table | the top level at which the ground is saturated with water, the water table rises with heavy rains and falls during dry spells |
| water vapor | water in the form of gas, when it is heated to 212 degrees Fahrenheit (100 degrees Celsius) |
| water pollution | making water unfit for drinking, swimming, or other purposes |
| watershed | an area where rainwater soaks into the soil and drains into a river or a stream |
| water | the most common substance on earth, covers 70% of the earth's surface, compound with 2 atoms of hydrogen and one atom of oxygen |
| ice | solid water, when the temperature is below 32 degrees Fahrenheit (0 degrees Celsius |
| aquifer | a layer of permeable soil or rock that allows water to move in and out freely |
| porous | full of pores or tiny holes that liquids and gases can pass through |
| well | a hole in the ground that reaches down to water |
| artesian well | well that reaches down to water under pressure, this water comes to the surface without being pumped |
| levee | tall wide protective walls often made of compacted soil |
| flood | a flow of water over normally dry land |
| flood plain | a low flat area alongside a river that floods when the river overflows its banks |
| adhesion | attraction between water and another substance |
| cohesion | attraction of water molecules to each other |
| surface tension | created due to the attraction of water molecules to other water molecules and not the air, protective skin |
| chromatography | process for separating mixtures |
