Across
- 4. deposit of moist sand and clay that can be mined to exact bitumen
- 7. compund derived from oil that is used to make products
- 8. a liquid fossil fuel made up mostly of hydrocarbons
- 10. rock that contains hydrocarbons
- 13. expression of how much of the enrgy put into a system actually does useful work
- 14. an icelike solid thatcan consists of molecules of methane within a crystal network of water molecules
- 15. type of mining pollution that occurs when oxygen and rainwater react with newly exposed rock that contains iron sulfide
- 16. burning :the chemical reaction when fuel combines rapidly with oxygen
Down
- 1. stored energy
- 2. the energy produced by motion
- 3. vertical shafts are are dug deep into the ground
- 5. energy that can be restored
- 6. energy prouced by the flow and interactions of electrons
- 9. reducing energy use to prolong the supply of fossil fuels
- 11. resource that cannoy be replaced
- 12. which layers of surface soil and rock are removed from large areas