Earth's History Part 1

The fossil record help scientists

• better understand the kind of organism that lived in the past
• better understand how the environment has changed over time
• better understand how organisms have evolved over time 
• all of the above

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A geologist discovers a fossil in different layers of rock. Which layer is the oldest? 

• the fossils in the upper rock layers
• the fossils in the lower rock layers

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A trace fossil is 

• a fossil that is used to establish the age of a rock layer
• the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rcok
• a mark that formed in rock by the movement of an animal on or within soft sediment (rock)

The fossil record is 

• incomplete: scientists do not have a continuous record of changes in life on Earth
• complete: scientists have a continuous record of changes in life on Earth

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Identify this fossil.

• mold

• trace

• remains

• cast

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Identify this fossil.

• mold

• trace

• carbon film

• remains

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An organism can be preserved by

• freezing

• being ingested by another organism

• changing over time

• trapped in lava

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Where are fossils usually formed?

• in rock

• in sedimentary rock

• in ice

• in metamorphic rock

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Scientists who study fossils are called

• archeologists

• geologists

• hydrogeologists

• paleontologists

Used to determine whether an object is older or younger than other objects

• Superposition
• Relative Dating
• Fossil
• Unconformity