Geologic Time and Fossils

Which of these describes a species that has become extinct?

• fewer members of the species are dying than being born

• more members of the species are dying than being born

• very few members of a species are alive

• all members of a species have died

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What is the Geologic Time Scale?

• old geologists

• sweet geology music

• Earth's history divided by major events and changes on Earth

• a list of every living thing ever

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Paleozoic, Mesozoic & Cenozoic are all

• Epochs

• Eras

• Periods

• Eons

What type of event usually marks the end of an Era

• A Mass Extinction

• High School graduation

• An earthquake

• A Volcanic Eruption

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What is a mass extinction?

• When life is not affected by an event

• When multiple species from all over the earth suddenly go extinct

• When one species goes extinct due to habitat changes

• When all life on earth is wiped out

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What are fossils that are abundant, easily recognizable, short lived, and widespread called?

• Preserved fossils

• Index fossils

• Imprints

• Radioactive dating

Preserved remains of plants and animals from the remote past are called?

• Sedimentary rocks

• Radioactive dating

• Decayed organisms

• Fossils

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Which of the following statements about the fossil record is true?

• all organisms become fossils

• organisms having soft body parts make up most of the fossils

• all organisms that have shells become fossils

• the fossil record is incomplete

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The Law of Superposition states

• Younger rocks layers are on top of older rock layers

• Fossils are found in sedimentary rocks

• Older rock layers are on top of younger rock layers

• Absolute age dating

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What does absolute age tell us about a rock layer or fossil?

• The 'exact' age of a fossil determined by radiometric dating

• The relative age of a fossil determined by radiometric dating

• Younger rock layers sit on top of older rock layers

• Older rock layers sit on top of younger rock layers

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