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Fossil Fuels 1

Across
Time when half of Earth's oil has been exploited
Sedimentary rocks impregnated with thick oils
Region that contains most of the world"s oil reserves
The 25% of oil that can be simply pumped from the ground
The refining of crude oil into gasoline and other products
The sinking of land from which oil and gas has been withdrawn
Continent with world's largest coal reserves
Primary contribution of fossil fuels to climate change
Common coal mining technique in the US where soil and rock are peeled away
Down
Three types of nonrenewable energy made from ancient compressed organic material
Restoration of a damaged area
Coal with lowest energy content
Controversial coal mining technique in West Virginia that dumps rock and debris into streams
New technology that recovers natural gas from shale deposits
Aquatic location of ANWR oil deposits
Coal with lowest sulfur content and highest energy content
Frozen marsh gas
Type of trap rock that frequently keeps light oil and gas from evaporating
Primary reason drilling for oil in Alaska is unpopular