A Trip Through Geologic Time

Magma that forces its way into rocks and hardens is called a(n)

• extrusion

• fault

• unconformity

• intrusion

A petrified fossil forms when

• an organism is frozen

• minerals replace all or part on an organism

• an organism becomes trapped in amber

• gases escape from the organism and leave carbon behind

The earliest forms of life appeared during

• the Paleozoic

• the Cenozoic

• Precambrian time

• the Mesozoic

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Fossils provide evidence for all of the following EXCEPT for

• changes in Earth's surface

• how Earth originally formed

• how environments on Earth changed over time

• how groups of organisms have changes over time

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In the Cambrian Explosion,

• the supercontinent broke apart

• an asteroid collided with Earth

• a great number of different organisms evolved

• mammals spread into every environment on Earth

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Most fossil form when organisms die and are buried in

• sediment

• faults

• unconformities

• ice

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Scientists use radioactive dating to

• determine that absolute age of rocks

• discover the source of index fossils

• determine the relative ages of extrusions

• find trace fossils in igneous rocks

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The __________ of a radioactive element is the time it takes for half of the radioactive atoms to decay.

• quarter-life

• unconformity

• half-life

• intrusion

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Animals without backbones are called

• vertebrates

• wimpy

• cowards

• invertebrates

A scientists who studies fossils is called a(n)

• paleontologist

• geologist

• biologist

• ornithologist

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