1
Q
Igneous
A
Of volcanic origin (either lava or magma)
2
Q
Extrusive rock
A
When lava cools quickly
crystals barely noticeable
Darker rock (sim to basalt)
3
Q
Pumice
A
An extrusive rock
As magma rises, pressure drops and gases expand
Gases shooting outward form the low density porous rock pumice
4
Q
Lava
A
Cools above ground
Can lead to
5
Q
Magma
A
Usu cools underground (intrusive)
Well-formed random arrangement of crystals, intrusive
6
Q
Intrusive
A
random arrangement of large crystals
Lighter colored rocks
High silica content
7
Q
Granite
A
Igneous intrusive
8
Q
Where does cementation occur?
A
Below compaction layer
TeXes Science 116 - 6th Grade Material
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