Geologic Time Review

A fossil is ____.

• any dead organism.

• the preserved remains or traces of an organism

• a perfect copy of a rock

• an unusual type of rock

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How do most fossils form?

• living things die and their remains are buried by sediment

• hard parts of an organism dry out in the air

• soft parts of an organism change to stone

• freezing preserves the remains of an organism

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

• mold

• cast

• petrified fossil

• trace fossil

___________ can provide clues about the activities of ancient organisms.

• trace fossils

• carbon films

• remains preserved in amber

• molds and casts

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NGSS.MS-LS4-1

The process by which all the different kinds of living things have changed over long periods of time is called __________.

• sedimentation

• deposition

• replacement

• evolution

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A type of organism that no longer exists on Earth is said to be _____________.

• fossilized

• extinct

• sedimentary

• petrified

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The relative age of rock is __________.

• its age compared to the ages of other rocks

• less than the age of the fossils the rock contains

• the number of years since the rock formed

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The law of superposition states that, in horizontal layers of sedimentary rock, each layer is _____.

• younger than the layer above it and older than the layer below it

• neither older nor younger than the other layers

• older than the layer above it and younger than the layer below it

• always older than any vertical layers

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The fossils of organisms that were widely distributed but only lived during a short period of time are called _____.

• Trace Fossil

• Index Fossil

• Petrified Fossil

• Carbon Film Fossil

The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called _____.

• centuries

• periods

• layers

• eras

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