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Igneous Rocks
Test Description: Test your knowledge about Igneous Rocks
Instructions: Answer all questions to get your test result.
1) An intrusive igneous rock is one that forms
A
from lava on Earth's surface
B
when volcanoes erupt
C
when magma cools within Earth
D
from silica-rich magma
2) When classifying an igneous rock, scientists often determine its
A
crystal structure
B
silica content
C
intrusive size
D
extrusive size
3) Intrusive igneous rocks can make long-lasting landforms because they tend to be
A
harder than other surrounding rock
B
easily broken by wind and water
C
protected from wind and water
D
softer than other surrounding rock
4) Hot lava flows out of a crack in Earth's surface and cools to form
A
small pools of magma
B
large, jagged crystals
C
intrusive igneous rock
D
extrusive igneous rock
5) Molten rock that has cooled and become solid is
A
sedimentary rock
B
metamorphic rock
C
a fossil
D
igneous rock
6) Which is the most important in determining the size of mineral crystals in igneous rocks?
A
rate of cooling of the magma
B
silica content of the magma
C
initial temperature of the magma
D
total composition of the magma
7) Which texture describes an igneous rock with lots of holes?
A
pyroclastic
B
aphanitic
C
vesicular
D
porphyritic
8) Which texture describes an igneous rock with no grains at all?
A
Vesicular
B
Glassy
C
Porphyritic
D
Phaneritic
9) Which of the following is an igneous rock?
A
gypsum
B
limestone
C
gneiss
D
basalt
10) Molten rock that reaches Earth's surface is known as
A
quartz
B
crystal
C
magma
D
lava
*select an answer for all questions
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