GEOLOGY

Detailed explanation-1: -A mold is formed when an organism dies and the remains decay, leaving behind an imprint in the sediment. A cast is formed from a mold – sediment or other minerals fill in the hollowed area, creating a three dimensional cast of the organism.

Detailed explanation-2: -Mold Fossil: Forms when sediments bury an organism and the sediments change into rock; the organism decays leaving a cavity in the shape of the organism.

Detailed explanation-3: -Sometimes, open pores in the rock let water and air reach the organism or part, causing it to decay or dissolve. What is left behind is a cavity in the rock where the organism or part was. This empty space is called a mold. A mold shows the original shape and surface of the organism or part.

Detailed explanation-4: -Molds fossils: A fossil mold is created when a shell or other structure is buried in sediment and then dissolved by underground water. The mold reflects only the shape and surface markings of the organism. It doesn’t reveal any information about its internal structure.

Detailed explanation-5: -Sometimes when an animal dies and its body decays, it can leave an imprint in the sediment. If this imprint fills in with minerals from sediment and groundwater, it can harden to form a fossil. This fossil is called a cast fossil. The fossilized imprint is called a mold fossil.