Igneous Rocks Answers

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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
2
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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
5

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
6

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
7

Which phrase describes an extrusive rock?

A
fine texture
B
cooled slowly
C
found deep underground
D
different, easily observed minerals
8

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.
9

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
10

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

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