M2 EARTH SCIENCE MEGAWORD SUPP

3. One of three sections of river.
4. An abandoned meander full of swamp water. (5,4)
6. A curve in a river found mainly in the middle course.
7. A precursor to coal. A biomass that forms in a giant O horizon. Used as fuel in some countries.
8. Greek for rock oil. Oily combustible substance found in some sedimentary rocks.
13. A non-renewable energy source that does not rely on hydrocarbons.
14. A necessary precursor to igneous rock, but not sedimentary or metamorphic.
15. A fuel which contains carbon, hydrogen and oxygen. eg. wood, cow dung, alcohol.
16. The rock type which forms from molten rock.
18. Traces of dead organisms found in sedimentary rocks.
19. This energy source uses water and gravity to produce electricity.
24. The rock type which forms when a rock is put under intense heat and pressure, but does not melt.
25. The rock type which forms from weathered rock.
26. Triangular landform formed by deposition at the mouth of a river.
27. A kind of sedimentary rock used as a fuel. Made from fossilised peat.
29. The slowest of Nature's cycles.
30. An alternative form of electricity production popular in Thailand. Does not involve a turbine.
31. Typically the hardest of the three rock types.
33. The form of energy found in fossil fuels.
34. A medium grade, medium energy coal.
35. The amount of empty space or voids in a soil or rock sample.

1. This word (meaning untrustworthy) describes solar and wind energy sources.
2. In electricity production this device comes after the boiler, but before the generator.
5. The process by which rock sediments such as sand are formed.
6. This very hot rock (ca. 3000 deg C) is plastic when in the mantle.
9. A device used to control the voltage of electricity.
10. This molten rock can flow.
11. The famous 'floating rock' that is porous but not permeable.
12. The waste product of a hydrogen fuel cell.
17. Describes the main elemental composition of petroleum, natural gas and coal.
20. When producing electricity from fossil fuels, chemical energy is turned into this form before turning into kinetic energy.
21. The churning of magma in the Earth's mantle is caused by this physical process.
22. Another way of saying petroleum. (5,3)
23. Energy production which harnesses heat from the Earth's mantle for electricity generation.
26. This geological process causes beaches to appear on the inner curve of a meander.
28. The highest grade of coal.
32. The steepest, fastest, narrowest course of a river.