Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

1		2	3			4				5		6		7
8								9
										10
11		12
		13							14			15		16
				17		18
19
20						21			22	23
					24			25					26
			27		28							29
		30										31
											32
33

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Across: 2. Type of igneous rock containing large crystals. 5. Outer solid layer of the earth. 8. Category of rock made of cemented grains. 10. Type of rock made by metamorphosis of mudstone used as a roofing material. 11. Type of sedimentary rock made from the remains of sea creatures. 13. Initials used in the Roman Calendar to show years since the birth of Jesus. 14. Fluid layer of earth's interior. 18. Part of a sea creature (chemically calcium carbonate) which makes 11 across. 20. Structure from which 27 down flows. 22. Friction between these moving structures cause earthquakes. 24. Like. 25. Innermost layer of Earth made of iron. 26. Preposition to an infinitive. 28. Abbreviation for a substance used to estimate pH. 29. One makes a tin, while two make the French dance. 30. Type of sedimentary rock formed from prehistoric deserts. 31. _ _ Man River, He just keeps rolling along. 32. A (Rolling?) stone from the seaside? 33. Category of rock containing crystals in layers.

Down: 1. Dense black igneous rock with very small crystals. 3. This happened to the Himalayan mountains when the Indian tectonic plate collided with the Asiatic plate. 4. Category of rock containing randomly arranged crystals. 5. The size of this rock feature helps determine the rate of cooling when an igneous rock formed. 6. Nitrogen-containing compound excreted by most land animals. 7. Large quantities of this are required to form any sort of rock. 9. Period of time; eg Ice _ _ _ or teen_ _ _. 12. Metamorphosed limestone. 14. Abbreviation for millilitre. 15. Human remains most likely to be preserved as fossils. 16. Breakdown of rock 17. This, combined with high pressure, is required to metamorphose rock. 19. A little less than too hot? 21. Band of water in the desert. 23. Size of crystals in igneous rock produced by very slow cooling. 24. Of the ear. 25. Material for the ears of those who don't catch on quickly. 26. Powdered soapstone. 27. Liquid rock. 29. One process required to form igneous rock from 27 down. (The other is crystallise.)