Across
- 3. The top layer of soil
- 7. energy that comes from a source that won't run out
- 8. Turning used items into new, often different items
Down
- 1. Anything that dirties earth
- 2. Cannot be replaced quick enough to meet our needs
- 4. Man-made products
- 5. An energy source formed in the Earth's crust from decayed organic material.
- 6. Any type of energy generated by the sun