the Last Rock

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Across
  1. 3. Igneous rock - large crystals in a matrix of smaller crystals
  2. 6. When the nucleus of an atom spontaneously breaks apart (2 words)
  3. 8. The type of boundary when two plates collide
  4. 14. A light coloured silicate rock
  5. 15. A fissile sedimentary rock made of silt and clay sized particles
  6. 16. "Formed by fire"
  7. 17. A silicate mineral that forms thin sheets and is shiny
  8. 23. A large body of igneous intrusive rock
  9. 24. One of the principles of relative dating that says the oldest rocks are on the bottom
  10. 25. A plastic-like layer in the mantle
  11. 26. The last supercontinent
  12. 30. When an igneous rock is cooled on the surface
  13. 31. Compaction and cementation of sedimentary rocks
  14. 33. Break down of rock
  15. 36. A landform resulting from chemical weathering of limestone
  16. 37. A very soft mineral with a pearly luster
  17. 39. Very fine textured igneous rock, formed by rapid cooling
  18. 40. The only mineral made with only Si and O
  19. 41. Time required for half of the nuclei of an isotope to decay
Down
  1. 1. A mica in the ferromagnesian family
  2. 2. Another word for density
  3. 4. Elements that have different atomic masses
  4. 5. A phaneretic mafic rock
  5. 7. Mid Atlantic ridge is an example of this type of tectonic boundary
  6. 9. A texture that shows a preferred arrangement of crystals in metamorphic rocks
  7. 10. Part of the Earth’s core that is solid
  8. 11. Tendency of a mineral to break along planes of weaker bonding
  9. 12. Fracture in crust along which displacement has taken place
  10. 13. an aphanitic felsic rock
  11. 18. A silicate mineral that is often pink in colour
  12. 19. A medium-grade metamorphic rock with a medium to coarse grained crystals with a planar or layered structure.
  13. 20. A very soft mineral used in the construction industry
  14. 21. A type of sedimentary rock made from small pieces of pre-existing rocks
  15. 22. An unconformity that resembles a bedding plane
  16. 24. Type of volcano of the Hawaiian Islands
  17. 27. Removal of sediments
  18. 28. When sediments get laid down
  19. 29. Appearance of light reflected from the surface of a mineral
  20. 32. Another word for dark silicate
  21. 34. Size, shape and arrangement of interlocking crystals
  22. 35. A rock that includes jagged rock fragments
  23. 38. The powdered form of a mineral