Geologic Time — Unit test Answers
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Which unstable element is used to determine the age of volcanic rock?
A
argonB
carbon-12C
potassiumD
carbon-1422
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Which phrase describes organisms that formed index fossils?
A
are extinctB
had soft partsC
were generally largeD
lived in a narrow geographic area23
How do organisms form carbon films?
A
Organisms turn into rock.B
Residue is left on rocks when organisms decay.C
Hollow forms are left in sediment by decaying organisms.D
Organisms leave evidence of their activities, such as footprints.24
Study the geologic time scale.The Eocene period exists in Earth’s history around 34 MYA. What could a scientist do to determine what era the Eocene period belongs to on the geologic time scale?
A
learn what happened during Precambrian timeB
study information related to the Cenozoic eraC
view the timing of events in the Mesozoic eraD
research events that happened during the Paleozoic era25
Which statement explains something that the fossil record indicates?
A
Earth is is still a very young planetB
Mammals have always existed on Earth.C
Mass extinctions have occurred several times on Earth.D
The amount of water on Earth has decreased over time.Did you find these answers helpful?
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