Geology

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Across
  1. 2. rock formed when pre-existing rocks are exposed to intense heat and pressure
  2. 3. tendency of a mineral to split along flat surfaces
  3. 6. how each of the three major rock types form and break down
  4. 7. naturally occurring mass of one or more minerals
  5. 12. rock formed from pre-existing rocks or pieces of once-living organisms through layering and compaction
  6. 14. when rocks are changed over a wide area by the forces of plate tectonics
  7. 15. extremely hot liquid and semi-liquid rock located under Earth's surface
  8. 16. repetitive layering in metamorphic rock
  9. 19. sedimentary rock that is composed of the remains of small organisms
  10. 20. how easily a mineral is scratched
Down
  1. 1. when rocks are changed due to contact with an intrusion of magma
  2. 4. the way a mineral reflects light
  3. 5. when a mineral splits along rough edges
  4. 8. molten rock emerging as a liquid onto Earth's surface
  5. 9. igneous rock that forms from magma under Earth’s surface
  6. 10. the color of a mineral in its powdered form
  7. 11. sedimentary rock composed of fragments of pre-existing rock that have been transported some distance from their points of origin
  8. 13. igneous rock formed from lava that was poured out or ejected at Earth's surface
  9. 17. rock formed from magma or lava
  10. 18. a naturally occurring inorganic element or compound