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Environment of formation
Characteristics
Igneous Rock ID
Rock Cycle
100
#1
Extrusive; because the rock formed at Earth's surface.
100
#5
darker.
100
#13
Obsidian.
100
#18
Metamorphic Rock.
200
#3
is longer or... is slower
200
#2
1
200
#16
3
200
#6
2
300
#7
4
300
#14
Iron and Magnesium.
300
#8
Scoria.
300
#17
melting ---> magma --> solidification --> igneous rock
400
#12
Extrusive.
400
#10
lighter color, lower density.
400
#4
4
400
#19
Because this is the only environment that provides enough heat and pressure to metamorphose (change the rock) the rock.
500
#9
Intrusive.
500
#15
lighter.
500
#11
Diorite.
500
#20
They must uplift. Tectonic plate motion must push these rocks to the surface to be eroded.