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