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..

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