Oil shale<span> is a type of </span>sedimentary rock<span> that is rich in kerogen. </span>Kerogen<span> is a part of rock that breaks down and releases hydrocarbons when heated. </span>Hydrocarbon<span>s are substances made entirely of hydrogen and carbon. </span>Petroleum<span> and </span>natural gas<span> are probably the most familiar hydrocarbons. The hydrocarbons in oil shale can be used as an alternative to petroleum or natural gas.</span>
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Top 10 Darfur Genocide Facts: In 1989, then-General Omar al-Bashir seized control of Sudan through a military coup. The country was in the middle of a 21-year civil war between the North and South regions when the leader came to power and tensions continued to build.
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