Fossils are found in..., sedimentary rock, Step 1:, An animal dies., Step 2:, The animal decomposes, leaving a skeleton., Step 3:, The skeleton is buried by layers of sediment. This takes millions of years!, Step 4:, The sediment hardens. Water seeps in and dissolves the bones. Minerals in the water fill the space left by the bones and form a fossil., The layers of rock gradually wear away..., and the fossil is exposed.

Fossils

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