GEOLOGY
PALEONTOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A mold fossil is preserved original tissue, and a cast fossil is petrified.
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A cast fossil is an impression in rock, but a mold fossil is an impression that was filled in with minerals.
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A mold fossil is an impression in rock, but a cast fossil is an impression that was filled in with minerals.
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They are two terms for the same kind of fossil.
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Detailed explanation-1: -C.A mold fossil is just an impression in rock; a cast fossil is an impression that was filled in with minerals.
Detailed explanation-2: -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-3: -A fossil mold is the shape of an organism that remains in rock after the organism’s hard parts decay or dissolve. A fossil cast is a sort of replica of the original organism that is produced when a fossil mold fills with mineral-rich water and sediment that eventually harden in the shape of the organism.
Detailed explanation-4: -Body fossils include molds and casts.
Detailed explanation-5: -Like other fossils, molds and casts provide information about deceased organisms. They are a shape left behind by an organism, rather than a body part that has been directly preserved such as wood or bone.