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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
when magma cools within Earth
B
when volcanoes erupt
C
from lava on Earth's surface
D
from silica-rich magma
2) When classifying an igneous rock, scientists often determine its
A
intrusive size
B
extrusive size
C
crystal structure
D
silica content
3) Intrusive igneous rocks can make long-lasting landforms because they tend to be
A
harder than other surrounding rock
B
softer than other surrounding rock
C
easily broken by wind and water
D
protected from wind and water
4) Hot lava flows out of a crack in Earth's surface and cools to form
A
extrusive igneous rock
B
intrusive igneous rock
C
small pools of magma
D
large, jagged crystals
5) Molten rock that has cooled and become solid is
A
a fossil
B
sedimentary rock
C
metamorphic rock
D
igneous rock
6) Which is the most important in determining the size of mineral crystals in igneous rocks?
A
silica content of the magma
B
rate of cooling 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
porphyritic
B
aphanitic
C
pyroclastic
D
vesicular
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
basalt
B
gneiss
C
limestone
D
gypsum
10) Molten rock that reaches Earth's surface is known as
A
magma
B
crystal
C
lava
D
quartz
*select an answer for all questions
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