Across
- 2. Rocks on the Earth are made up of substances called___________.
- 4. Efficient use.
- 6. make new items from old ones.
- 7. Use an item again
- 9. use less of something
- 10. erosion Removal of the uppermost layer of the soil by the process of wind or water.
Down
- 1. Provide us with food and produce oxygen to breathe.
- 3. fuel It is formed by the remains of dead animals and plants.
- 4. A fossil fuel, found under the Earth and used for cooking.
- 5. Things available in the environment that is used by human beings to satisfy their needs.
- 8. The uppermost thin layer of the Earth's surface which is rich in nutrients.