fossil fuel - a source of energy made from the remains of ancient, once living things, coal - hard black or brown substance found in Earth and burned as fuel, decay - the process of rotting, natural gas - mixture of gases found in Earth's crust, oil - liquid found beneath Earth's surface used as fuel, petroleum - thick oil , ancient - very, very old, swamp - low, wet area with lots of plant matter, organic matter - remains of once living things, THOP - time, heat, organic matter, pressure,

C8L2: Fossil Fuels (5.10B)

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