Igneous Rocks Answers

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1
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Which phrase describes a feature of igneous rocks that cool quickly during formation?

A
small crystals
B
coarse surfaces
C
found beneath Earth’s surface
D
exposed after erosion occurs
2
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Which two features of igneous rocks are determined by their cooling rate?

A
color and shininess
B
shininess and hardness
C
hardness and crystal size
D
crystal size and rock texture
4

Which two materials form igneous rocks upon cooling?

A
lava and crystals
B
magma and lava
C
crystals and intrusive rocks
D
intrusive rocks and sediment from rocks
5

Which phrase describes an extrusive rock?

A
fine texture
B
cooled slowly
C
found deep underground
D
different, easily observed minerals
6

Which type of rock forms when molten material cools and hardens inside Earth?

A
an igneous rock
B
an extrusive rock
C
a rock with fine texture
D
a rock with small crystals
8

An igneous rock is found on the ground and has no identifiable crystals. What is the most likely origin of this rock?

A
molten material that cooled slowly
B
molten material that cooled quickly
C
rock that was eroded by surrounding rocks
D
rock that was exposed to extreme pressure
9

How are rocks that cooled within magma chambers found on Earth’s surface today?

A
They are pushed up by magma under Earth’s surface.
B
They are revealed by erosion of Earth’s surface over time.
C
They are pushed to Earth’s surface because of their larger size.
D
They are revealed at Earth’s surface due to their low density.
10

An igneous rock is light in color and has extremely coarse grains. What is the most likely origin of the rock?

A
a magma chamber
B
the bottom of the ocean
C
an outer slope of a volcano
D
the shore of a volcanic island

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