GEOLOGY

Detailed explanation-1: -When an organism dies, its soft parts often decay quickly or are eaten by animals. That is why only hard parts of an organism generally leave fossils. These hard parts include bones, shells, teeth, seeds, and woody stems. It is rare for the soft parts of an organism to become a fossil.

Detailed explanation-2: -The soft parts of the animal eventually decay away and leave behind the hard parts like bones and shells. Over millions of years, the sediment and animal’s remains continues to get buried beneath more and more layers of sediment.

Detailed explanation-3: -The soft parts of the organisms get decompose, leaving the hard bones or shells behind. Over the period sediments forms over the top of the hard bones or shells which hardens it into a rock. Hard bones and shells forms cast.

Detailed explanation-4: -For an organism to be fossilized, the remains usually need to be covered by sediment soon after death. Sediment can include the sandy seafloor, lava, and even sticky tar. Over time, minerals in the sediment seep into the remains. The remains become fossilized.

Detailed explanation-5: -cast: A mold filled with sediment and hardened to create a replica of the original fossil. mold: An impression made in sediments by the hard parts of an organism. permineralization: Fossilization in which minerals in water deposit into empty spaces in an organism.