CP3

1. A name used to describe energy when it is stored inside atoms. Another name for 'atomic energy'.
3. A name used to describe energy when it is stored in chemical substances.
5. Spread out.
7. The movement of particles in a fluid (gas or liquid) depending on their temperature. Hotter, less dense regions rise, and cooler, denser regions sink.
9. An energy resource that will never run out (e.g. solar power).
13. A fuel formed from the dead remains of organisms over millions of years (e.g. coal, oil or natural gas).
15. To soak up or take in.
16. A name used to describe energy when it is stored in moving things.
17. The way energy is transferred through solids by heating. Vibrations are passed on from particle to particle.
18. A unit for measuring energy.

2. To reduce friction by putting a substance (usually a liquid) between two surfaces.
4. A way of transferring energy by heating.
6. A name used to describe energy when it is stored in hot objects.
8. A material that does not allow something, e.g. heat or electricity, to pass through it.
10. Any energy resource that will run out because we cannot renew our supplies of it (e.g. oil).
11. A way of saying how much energy something wastes.
12. A name used to describe energy when it is stored in stretched or squashed things that can change back to their original shapes. Another name for ‘strain energy’.
14. A name used to describe energy when it is stored in objects in high places that can fall down.