• Coal forms from dead plants that settled at the bottom of swamps millions of years ago.
  • Coal is mostly carbon, but some other elements can be found in coal, including sulfur.
  • The coal with the least sulfur is the cleanest coal.
  • The heat from the burning coal is used to boil water, which makes steam.
  • The steam spins turbines, which creates electricity.
  • The United States is rich in coal (Figure below).
  • Many regions of the country have significant coal deposits.
  • The hardest type of coal, anthracite, is a metamorphic rock.
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