ANSWERS: 3
  • Rocks are made of mineral crystals -- even ordinary looking rocks that don't sparkle are made of crystals, which might be microscopic in size. The minerals are diverse compounds composed of many different chemical elements. The following table is copied from: http://hyperphysics.phy-astr.gsu.edu/Hbase/tables/elabund.html Element....Approx % weight of Earth's Crust Oxygen.......46.6 Silicon........27.7 Aluminum....8.1 Iron................5.0 Calcium.......3.6 Sodium........2.8 Potassium...2.6 Magnesium..2.1 All others......1.5
  • various minerals, combined in various ways.
  • i dont know i want to know lol;)

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