Unit Test — Cumulative exam Answers

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Which characteristic is used to classify metamorphic rocks as foliated or non-foliated?

A
grain size
B
layer thickness
C
arrangement of layers
D
arrangement of grains
3

What occurs when Earth’s shadow covers the moon?

A
neap tide
B
spring tide
C
solar eclipse
D
lunar eclipse
4

Which statement explains what happens to older crust during seafloor spreading?

A
It is destroyed at coastlines.
B
It moves under continents.
C
It is destroyed at a mid-ocean ridge.
D
It moves away from a mid-ocean ridge.
7

Which is one source of the sediments that form sedimentary rocks?

A
chunks of coal
B
particles in new rocks
C
liquid magma
D
materials dissolved in solutions
9

What type of stress occurs when plates move apart?

A
compression
B
faulting
C
shearing
D
tension
11

Which is the final event that occurs when a star is forming?

T
The outer layer of the star expands.
G
Gravity pulls gas and dust together.
A
A black hole forms as the core collapses.
N
Nuclear fusion begins under high pressure.
12

Which statement describes the law of superposition?

A
Sedimentary rocks were originally in horizontal layers.
B
In horizontal rock layers, each layer is younger than the one below it.
C
Rock layers must be in existence before something can happen to them.
D
Rocks that are not in horizontal layers were shifted by some geologic event.
13

Which event is most likely if an index fossil is found in a layer at location 1, but the layer and index fossil are not found at location 2 nearby, which is known to be the same relative age?

A
The layer at location 2 is too old to contain fossils.
B
The locations were too close together.
C
The organism did not exist at location 2.
D
The layers at location 2 formed much earlier than those at location 1.
14

What was discovered in 1965 and is believed to be leftover thermal energy from the big bang?

r
red shift
t
the Eagle Nebula
t
the Doppler effect
b
background radiation
16

The image shows a type of fault.

Question illustration
A
compression
B
gravity
C
tension
D
shearing
18

How long ago do scientists believe the continents formed Pangaea?

a
about 135 million years ago
a
about 180 million years ago
a
about 300 million years ago
a
about 4.5 billion years ago
20

Why do scientists study seismographs?

A
to learn about different rock samples
B
to determine the location of an epicenter
C
to analyze mineral content from Earth’s crust
D
to observe temperature changes on Earth’s surface

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