LIFE SCIENCE

Detailed explanation-1: -A cast is a solid copy of the shape of an organism. Molds and casts can preserve fine details. an organism become petrified . The term petrified means “turned into stone.” Petrified fossils are fossils in which minerals replace all of an organism, or a part, such as a dinosaur bone.

Detailed explanation-2: -A cast of the organism can then be made using the two types of mold. Natural casts can be formed when minerals are deposited within the mold. Casts can also be synthetically created when the molds are filled or covered with synthetic material such as latex or plaster of paris to generate a replica of the organism.

Detailed explanation-3: -We find molds where an animal or plant was buried in mud or soft soil and decayed away, leaving behind an impression of their bodies, leaves, or flowers. Casts are formed when these impressions are filled with other types of sediment that form rocks, which take the place of the animal or plant.

Detailed explanation-4: -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.

Detailed explanation-5: -Molds and Casts The most common fossils are molds and casts. Both copy the shape of ancient organisms. A mold is a hollow area in sediment in the shape of an organism or part of an organism. A mold forms when the hard part of the organism, such as a shell, is buried in sediment.