Types of Fossils

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What are fossils?

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Fossils are the remains or traces of ancient plants and animals that have been preserved in rock.

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NGSS.MS-LS4-1

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What is a cast fossil?

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A cast fossil is a type of fossil that forms when minerals fill in the empty spaces of a mold, creating a replica of the original organism.

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NGSS.MS-LS4-1

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What is a mold fossil?

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A mold fossil is an impression left in sediment or rock that shows the shape of an organism.

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NGSS.MS-LS4-1

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What are trace fossils?

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Trace fossils are geological records of biological activity, such as footprints, burrows, or nests, rather than the remains of the organism itself.

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NGSS.MS-LS4-1

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What is the difference between a mold and a cast fossil?

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A mold fossil is an impression of the organism, while a cast fossil is a solid copy formed from minerals filling the mold.

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What type of fossil is an ammonite?

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An ammonite is a type of index fossil that is used to date the rock layers in which it is found.

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NGSS.MS-ESS1-4

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What are the four main types of fossils?

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The four main types of fossils are body fossils, mold fossils, cast fossils, and trace fossils.

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What is an example of a body fossil?

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An example of a body fossil is a preserved bone or shell.

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What is the significance of fossils in understanding Earth's history?

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Fossils provide evidence of past life forms and help scientists understand the evolution of species and changes in the environment.

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

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True or False: Fossils can only be found in sedimentary rock.

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True.