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Fossil Fuels

E. Brand

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Across
2.underground geological structure that tends to trap oil or natural gas if it is present. (2 Words)
7.Combustible deposits in Earths crust (2 Words)
15.a measure of the fraction of energy used relative to the total energy available in a given source (2 Words)
16.black, combustible solid composed mainly of carbon, water, and trace elements found in Earth's crust
18.mixture of gaseous hydrocarbons (primarily methane) that occurs, often with oil deposits in Earth's crust. (2 Words)
19.removal of carbon from fossil-fuel combustion and storage of the carbon, usually underground (4 Words)
Down
1.clean-coal technology; crushed coal is mixed with limestone, neutralizes acidic sulfur compounds (2 Words)
3.a type of air pollution in which acid falls from the atmosphere to the surface as precipitation or as dry acid particles (2 Words)
4.form of government support (e.g. public financing or tax break) given a business/institution to promote that group.
5.extraction of mineral and energy resources near Earth's surface by first removing the soil, subsoil, and overlying rock strata. (2 Words)
6.extraction of mineral and energy resources from deep underground deposits. (2 Words)
8.Requires coal companies to restore areas that have been surface mined since 1877; (abbr.)
9.The amount of energy contained within a given volume or mass of an energy source. (2 Words)
10.using high -pressure water to open/widen gaps that allow natural gas or oil to flow, can result in water pollution
11.caused when sulfuric acid and lead, arsenic, and cadmium wash from mines into nearby lakes and streams. (3 Words)
12.liquid or gaseous fuel that is synthesized from coal and other naturally occurring resources, used in place of oil/natural gas
13.type of surface mining in which a trench is dug to extract the coal,. (2 Words)
14.Sedimentary rocks containing a mixture of hydrocarbons known as kerogen; crushed and heated to yield oil. (2 Words)
17.A thick, yellow to black, flammable liquid hydrocarbon mixture found in Earths crust

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