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