Igneous Rocks Answers

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Which feature is used to classify a rock based on its composition?

A
the origin of the rock
B
the texture of the rock
C
the types of minerals in the rock
D
the shapes of the crystals in the rock
2
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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
3

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
4

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
5

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
6

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.
7

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 has small, dark crystals. Which statement also accurately describes this rock?

A
It is an intrusive rock.
B
It has a coarse texture.
C
It was found on Earth’s surface.
D
It was formed from slow cooling.
9

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
10

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.

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