Across
- 4. The careful use of natural resources to make them last.
- 5. Cannot be replaced at the rate it is being used.
- 6. Can be replaced or never runs out.
- 7. Made by plants and animals and is converted into energy.
- 8. Oil, coal and natural gas & were formed from living organisms many years ago.
Down
- 1. Electricity produced by moving water.
- 2. The materials we use from nature to make the things we need.
- 3. Energy produced by heat within the Earth's crust.