Fossils and Geologic Time

A gradual change in living things over a long period of time is

• extinction

• evolution

• cast

• mold

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What type of rock do fossils form in?

• Igneous
• Sedimentary
• Metamorphic
• Classic

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How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

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The Geologic Time Scale is a record of what?

• old geologists
• sweet geology music
• the known history of rocks and fossils
• a list of every living thing ever

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What is a fossil that is useful for dating and correlating the strata in which it is found?

• a petrified fossil
• a trace fossil
• a cast fossil
• an index fossil

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According to most scientists, what is the ultimate cause of most mass extinctions?

• overhunting

• evolution of new species to replace old ones

• major change in environment

• asteroid impact

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NGSS.MS-LS4-1

Which of the following is NOT a reason a species may become extinct?

• competition
• reproducing
• habitat loss
• overhunting

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True or False? Many scientists think that an asteroid caused the dinosaurs to go extinct.

• True

• False

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What is a mass extinction?

• When all the species in a particular area on earth suddenly go extinct
• 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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NGSS.MS-LS4-1

What event marks the end of each geologic area?

• 1 million years
• burst of new life forms
• mass extinction
• ice age

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