Answer: The most common method of fossilization is called permineralization, or petrification. After an organism's soft tissues decay in sediment, the hard parts, usually the bones.
Explanation: These crystallized minerals cause the remains to harden along with the encasing sedimentary rock. These fossilization scenarios are a few of many possible processes that turn living organisms into rock-like material. Each process generally follows these three steps: decay, transport, and burial.