Which statement best describes an index fossil?

a fossil that can be used to establish the absolute age of a rock layer

Scientists have determined that the earth is about 4.6 billion years old, how do they know?

by using radiometric dating techniques on meteorites

What are four major divisions of time on your geologic time scale (the timeline you created).

Precambrian, Paleozoic, Mesozoic, Cenozoic

Which best describes a fossil that was discovered in rock at the base of a cliff?

It is older than a fossil at the top of the cliff

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Unit 2 - KRMS

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Answers

1
Which statement best describes an index fossil?
a fossil which is formed in soft sediment by the movement of an animal
a fossil of an insect captured in amber
a fossil that can be used to establish the absolute age of a rock layer
a fossil of an animal captured in ice
2
Which of these choices names two kinds of trace fossils?
petrified and mummified fossils
shells and bones
bee and beetle in amber
tracks and burrows
3
Scientists have determined that the earth is about 4.6 billion years old, how do they know?
by measuring the age of the oldest fossils
by using radiometric dating techniques on meteorites
by determining the chemical composition of sea-floor sediments.
by measuring the age of the oldest glaciers
4
What was used to create the divisions of time on the geologic timescale?
all of the above
break-up of continents
defining events
mass extinctions
5
What process forms a sea arch?
deposition
erosion
precipitation
volcanism
6
The remains of a once-living organism found in layers of rock, ice, or amber is called a
fossil
leftover
corpse
skeleton
7
What are four major divisions of time on your geologic time scale (the timeline you created).
eon, era, period, epoch
Pleistocene, Pilocene, Miocene, Oligocene
Precambrian, Paleozoic, Mesozoic, Cenozoic
Cretaceous, Jurassic, Triassic, Permian
8
Sharp, jagged mountain ranges become smoother and more rounded over time. Why?
collisions between continental plates
movement of continents
weathering and erosion
deposition
9
The time required for half the amount of radioactive material to decay into stable material is called its
half life
anniversary
geologic history
birthday
10
Which best describes a fossil that was discovered in rock at the base of a cliff?
It is most likely an index fossil.
It is younger than a fossil at the top of the cliff
It is older than a fossil at the top of the cliff
It is younger than a fossil halfway up the cliff.
11
The process where a radioactive isotope breaks down into a stable isotope.
radioactive decay
relative dating
radiometric dating
absolute dating
12
Why did geologists develop the geologic time scale?
to organize Earth’s history
to have a reason to color on long strips of paper
to give students one more thing to learn
to know when different species lived and went extinct
13
The scientific study of the origin, physical history, and structure of the Earth and the processes that shape it.
astronomy
biology
geology
cartography
14
The theory that states that the Earth’s lithosphere is made up of large, moving plates
uniformitarianism
catastrophism
plate tectonics
continental drift

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