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Across 2. This energy source comes from the thermal energy of rocks underground. 3. These fuels are made by living organisms. 4. This is an example of a biofuel. 7. This means a resource will not run out. 10. This problem is caused by increasing levels of greenhouse gases. (2 Words) 11. This means a resource will one day run out. 12. Fuels are burnt in power stations to generate this. 14. This problem is caused when pollution from power stations causes the rain to become too acidic. (2 Words) 15. This is a liquid fossil fuel that is used to generate electricity but also as a source of petrol and diesel.

Down 1. Coal, oil and natural gas are examples of these. (2 Words) 4. This energy source comes from the kinetic energy of the air. (2 Words) 5. This is when energy is released by nuclear reactions. (2 Words) 6. This greenhouse gas is a form of pollution that is released when we burn fossil fuels. (2 Words) 7. This means that you can depend upon something. 8. This is when energy is transferred from the kinetic energy store of water to generate electricity. 9. This energy source relies on tides caused by the Moon. (2 Words) 13. This is a solid fossil fuel that is mined from rocks underground.