Solve the puzzle

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