Across
- 2. is a fossil fuels formed from the remains of plants that died millions of years ago.
- 3. release the energy stored in the nucleus of an atom
- 4. we receive this energy resource directly from the Sun.
- 6. we use energy resources to generate this
- 7. uses heat energy generated deep inside the earth.
- 8. some energy resources are not always available when you need them.
Down
- 1. are replaced by planting new trees
- 5. an energy resource that is being (or can be) replenished as it is used.