Energy

3. limited in quantity and cannot be naturally replenished or regenerated
7. the process of moving from one place to another
8. of or from the Sun, or using the energy from the Sun
11. liquid petroleum that is found in Earth’s crust and extracted for burning as fuel
12. can be replaced or has an endless supply
16. the place something comes from or starts at
17. the comparison of useful output per required input
18. electrical energy resulting from the movement of an electrical charge
20. heat that is generated within Earth
21. the ability to do work
23. using as little of something as possible; wasting nothing or very little

1. relating to or involving technology
2. a mixture of gases produced by the breakdown of organic matter
4. specific categories of things that have something in common
5. a state of matter characterised by particles that lack both a definite volume and shape
6. a physical law that states energy cannot be created or destroyed but may be changed from one form to another
9. relating to the nucleus of an atom
10. the movement of air caused by the uneven heating of the Earth by the Sun
13. renewable organic material that comes from plants and animals used for energy production
14. a physical system that does not exchange matter with its surroundings but can exchange energy
15. the process of changing from one form to another
19. to produce, create, bring into existence, or cause something to happen
22. a black or brownish-black sedimentary rock that can be burned for fuel