Igneous Rocks Answers

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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
4

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.
5

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.
6

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
7

Which phrase describes an extrusive rock?

A
fine texture
B
cooled slowly
C
found deep underground
D
different, easily observed minerals
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 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
10

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

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