compunds: 1) are the same mixture 2) can be separated 3) contain only one type of element 4) have a different kinds of atoms chemically combined with each other ?
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Coal and petroleum are formed as a result of degradation of ancient plant life which lived millions of years ago. ... Over time, heat and pressure from geological processes transformed these materials into coal. Since these are formed from essentially fossils, they are also known as fossil fuels.
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