Science Vocabualry

5. A resource that, when it is used up, will not exist again during a human lifetime.
6. Particles of rock so small you need a microscope to see them.
7. The part of some soil that is made up of broken down parts of dead plants and animals.
8. The process by which water vapor changes into liquid water.
10. To reuse a resource by breaking it down and using it to make a new product.
12. An underground supply of water.
14. The process by which liquid water changes into water vapor.
15. Grains of rock that you can see with your eyes alone.
16. Grains of rock that are too small to see with your eyes alone.
18. A resource that can be used again and again.

1. The movement of water from Earth´s land, through rivers toward ocean, to the air, and back to the land.
2. Rain, snow, sleet, or hail.
3. Any harmful material in the environment.
4. A material that is found in nature and that is used by living things.
8. The saving of resources by using them wisely.
9. Water that has very little salt in it.
11. Soil that is a mixture of humus, sand, silt, and clay.
13. A resource that can be replaced within a human lifetime.
17. huge sheet or block of moving ice.