8.E.2.1 - What are fossils?

8.E.2.1

A Trip Through Geologic Time

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What is a fossil?

• any dead organism

• the preserved remains or traces of an organism

• a perfect copy of a rock

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Casts are

• the remains of broken dinosaur bones

• molds that have been filled by another type of rock over time

• the hollow remains of animal burrows

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In petrified wood, the original wood has been slowly replaced by

• another type of harder wood

• preserving salts

• minerals

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Fossils are

• only dinosaur bones and fern impressions made in rock.

• the carbonized remains of animals that were killed by an asteroid 20,000 years ago.

• direct evidence of organisms that lived more than 10,000 years ago.

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Scientists who study fossils are

• fossilologist

• paleontologist

• reptologist

• dinosaurologist

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In what type of rock would a geologist MOST LIKELY find evidence of ancient life?

• sedimentary

• foliated

• metamorphic

• igneous

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Which type of fossil can provide clues about the activities of ancient organisms?

• molds and cast

• trace fossils

• carbon films

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A fossil formed when minerals replace all or part of an organism is called

• mold

• cast

• petrified

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Examples of imprints are

• drawings on rock made by prehistoric men

• frozen remains of elephant-like mammoths

• footprints and animal tracks

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The unaltered remains of fossilized animals include

• petrified wood

• carbon imprints of ferns

• mummified and frozen remains