| A | B |
|---|
| ninety seven percent | Percent of the Earth's water that is salt water |
| three percent | Percent of Earth's water that is fresh water.. |
| Natural Resource | A useful material from Earth. |
| three-fourths | How much of the Earth's Surface is water? |
| water | Earth is sometimes called the _____ planet. |
| air, soil, water | examples of Natural Resources |
| living things | All _______ _______ contain water. |
| liquid solid gas | 3 states of matter |
| evaporate | When liquid water changes to a gas. |
| condense | When water vapor changes to a liquid. |
| water vapor | When water is a gas, it is called _____. |
| ice | When water is a solid, it is called _____. |
| water cycle | The path that water follows as it evaporates into the air, condenses into clouds, and returns to Earth as rain. |
| surface water | A source of water that already exists on land. |
| ground water | Water that soaks into the ground and fills the space between soil and rocks. |
| aquifer | An underground layer of rock where water collects. |
| reservoir | The place behind a dam where water collects. |
| water pressure | Water flows through pipes in your house because of _____ _____. |
| gravity | Water flows from a water tower because of _____. |
| freezing | The reason water mains are buried in the ground is to prevent them from _____. |
| hard | Water that contains a lot of minerals is said to be ____. |
| soft | Water containing few minerals is said to be ____. |
| distilled | Water that does not contain any minerals or chemicals is called _____. |
| dissolved | When minerals mix with water and separate into very tiny parts that cannot be seen. |
| germs | Water can contain tiny living things called ______. |
| chemicals | Germs can be killed by treating water with _____. |
| polluted | Water that contains unwanted or harmful materials. |
| currents | _____ can form as the wind blows over the surface of water. |
| tides | The moon pulls on Earth's surface, causing ____. |
| conserves | Fixing leaky faucets and doing full loads of laundry _____ water. |
