Across
- 1. The less energy people use, the better for the _______.
- 5. _________ destroy forests very quickly.
- 7. Hydrogen is an _________ gas that’s incredibly powerful.
- 8. Trees do important things to keep the ___________ safe.
- 9. A ____ turbine has three blades which are pushed round by the breeze.
Down
- 2. Trees and plants are great ______ stores.
- 3. The middle of our planet is so hot, that some rocks deep down ____.
- 4. The earth would be an icy _____ planet without the giant sun.
- 6. Fossil _____ are made from the remains of animals that died long ago.
- 7. core Geothermal energy is heat ______ underneath earth’s surface.