Fossil Fuels Env Sci chapter 17.2

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Across
  1. 2. settle on top of dead organisms
  2. 3. oil sands and oil shale may be used as sources of ______
  3. 5. Chemical compounds that are derived from oil and used to make products
  4. 6. gas tha produces a great deal of energy and is less polluting than other fossil fuels
  5. 8. An icelike solid that consists of molecules of methane within a crystal network of water molecules
  6. 10. found within porous rocks deep underground
  7. 11. in the future, ________hydrate from the deep ocean floor could be used for energy.
  8. 12. In 1300's, Native Americans of the __________ used colal to heat home, cook food, and fire pottery.
  9. 13. Is removed from the ground by stripmining or subsurface mining
Down
  1. 1. The practice of digging shafts deep into the ground to find and remove a mineral
  2. 4. The deposits of moist sand and clay containing bitumen
  3. 7. The extraction of a mineral by removing a strip of the layers of soil and rock on top of the mineral deposit
  4. 9. A rock filled with a mixture of hydrocarbons; can be burned