Examlex
Explain what the triple-alpha process is and when it takes place in evolving stars.
Coal
A combustible black or brownish-black sedimentary rock, formed from ancient plant matter, used as a fossil fuel.
Oil Shale
A type of sedimentary rock that contains kerogen, a mix of organic compounds from which liquid hydrocarbons can be produced.
Energy Resource
Any natural or artificial substance or mechanism that can be used to produce energy or power.
Fold
A bend in layers of rock or earth's crust caused by stress, resulting in curved or bent strata.
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