Igneous Rocks Answers

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1
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How do intrusive rocks form?

A
Lava cools slowly outside a volcano.
B
Magma cools slowly inside the Earth.
C
Molten material is cooled quickly by water.
D
Magma is ejected into the air and cools slowly.
2
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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
3

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
4

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
5

How are extrusive rocks formed?

A
Magma gets trapped inside Earth and cools to rock.
B
Volcanoes apply force to solid rocks and eject them.
C
Magma gets forced to Earth’s surface and cools to rock.
D
Volcanoes trap lava inside Earth, where it cools to rock.
6

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
8

Which trait is common to rocks formed from magma trapped inside a volcano?

A
less dense
B
fine crystals
C
coarse texture
D
quickly cooled
9

Which phrase describes an extrusive rock?

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

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