fossil, A fossil is the remains or trace of a living thing from long ago., decay, Decay is when something breaks down and rots over time., imprint, An imprint is a mark or shape left behind., sediment, sediment is small pieces of sand, mud or rock that build up in layers., pressure, Pressure is when something pushes down on something else., rock, A rock is a hard, natural material found in the ground..

Fossils

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