Rocks

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Across
  1. 3. extrusive rock that looks like black glass
  2. 7. molten rock on earth surface
  3. 9. clay,silt,sand,pebbles,cobbles,boulders
  4. 13. a type of igneous rock formed inside earth
  5. 14. intrusive rock with crystals larger than 10mm
  6. 15. a name for layers in rocks
  7. 16. extrusive rock that makes up our oceanic crust
  8. 17. means gas pockets or air bubbles in rock
Down
  1. 1. a monomineralic igneous intrusive rock made of Olivine only
  2. 2. extrusive rock with air bubbles that floats
  3. 4. remains of past life in a rock
  4. 5. variety of igneous rock dark in color rich in iron
  5. 6. in Greek means fire
  6. 8. a type of igneous rock formed on earth surface
  7. 10. molten rock inside earth
  8. 11. intrusive rock used for counter tops
  9. 12. variety of igneous rock light in color rich in silicates