Igneous Rocks Answers

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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

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

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.
7

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 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
9

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.
10

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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