sedimentary rock - Rocks that form when sediments are pressed and cemented together over time, fossil - The remains or traces of an organism that lived long ago, fossil fuels - Fuels formed in the Earth from plant or animal remains, petroleum - A type of natural oil that can be refined to make gasoline (fuel), conservation - The careful use and protection of natural resources, cementation - The minerals form a sort of glue that sticks the pieces of rock together, compaction - The process by which sediments are pressed together under their own weight, organic matter - Matter that has come from a recently living organism and is capable of decay (breaking down),

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