Rocks

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Across
  1. 3. Study of the Earth.Including rocks.
  2. 4. Also known as "halite".
  3. 8. Rock formed when magma cools.
  4. 9. Rock formed from the products of an explosive volcanic eruption.
  5. 11. A fine grained sedimentary rock.I the category of "mudstones".
  6. 12. Used for making statues, counters, and buildings. A game is named after this stone.
  7. 14. Small, flat surfaces that are shiny or sparkly, like tiny mirrors.
  8. 19. Extreme igneous rocks that are formed during the final stage of a magma's crystallization
  9. 21. Organic sedimentary rock that forms from the preservation of plant materials. Popular fossil fuel.
  10. 22. A metamorphic rock composed entirely of quartz.
  11. 26. Individual stone grains visible in a rock.
  12. 27. Sedimentary rock composed of silt-sized particles.
  13. 29. When wind and water break down a rock.
  14. 30. Holes like Swiss cheese in the rock.
  15. 33. A clastic sedimentary rock, that are composed of large angular fragments.
  16. 34. When layers of sediment stack up.
  17. 35. When a rock erodes it forms ___.
  18. 36. Contains large rounded clasts.
  19. 39. A metamorphic rock that is blue. It is used as a gemstone.
  20. 40. An igneous rock. This rock can float in water.
Down
  1. 1. An igneous rock with very high silica content. Pink in color.
  2. 2. The process when magma turns into a rock.
  3. 3. An igneous rock, used for most architectural purposes.
  4. 5. Igneous rock that looks like black glass, due to the fast cooling rate.
  5. 6. A solid material
  6. 7. Formed by the alternation of a shale stone.
  7. 10. Used in most steels.
  8. 13. A dark colored igneous rock. It has bubble like cavities.
  9. 15. A rock that has a soapy feeling.
  10. 16. Used to filter beer.
  11. 17. Made up mainly of very fine-grained mica.
  12. 18. A sedimentary rock. Was used for the tip of arrows back in the day.
  13. 20. Rock formed under the surface of the earth from a change due to intense heat.
  14. 23. Igneous rock that is usually dark green or black in color.
  15. 24. Also known as dolostone.
  16. 25. The process when a rock turns into magma.
  17. 28. Formed of silicon dioxide.
  18. 31. Rock formed from particles of sand, shells, pebbles, and other fragments.
  19. 32. Imprints of leaves, shells, insects, or other items in the rock.
  20. 37. A foliated metamorphic rock. Identified by its bands.
  21. 38. Rock composed of granite and basalt.