Rocks and Minerals

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Across
  1. 2. when magma or lava cool, this is the type of rock that forms
  2. 7. this mineral has a green-ish appearance, and sometimes forms the gemstone peridot
  3. 9. marble is this type of rock
  4. 11. this extrusive igneous rock is glass-like
  5. 15. this is also known as rock salt
  6. 17. this is one of the most common minerals on Earth, and it can come in many colors (including rose & smoky)
  7. 18. sandstone is this type of rock
  8. 19. this is an organic, combustible sedimentary rock formed from layers of ancient plants
  9. 20. heat and ____ can create metamorphic rock
Down
  1. 1. when a metamorphic rock has visible layers, it is...
  2. 3. this is an extremely soft, powdery mineral with a Mohs hardness value of 1
  3. 4. this type of metamorphism occurs when rock is very slightly melted by underground volcanic activity
  4. 5. this is a 10 on the mohs hardness scale
  5. 6. this sedimentary rock can become the metamorphic rock marble
  6. 8. this is an extrusive igneous rock that often forms at the bottom of the ocean
  7. 10. this mineral forms flaky sheets, and is often used in makeup products to add sparkle
  8. 12. a metamorphic rock that forms from granite
  9. 13. wind and water can cause pieces of rock to break off, a process known as...
  10. 14. this is a type of sedimentary rock formed from pieces of sediment
  11. 16. this is the term that describes how a mineral reflects light