Igneous Flashcards
1
Q
How do Intrusive Igneous rocks form
A
magma hardens beneath surface
2
Q
How do Extrusive Igneous rocks form
A
lava hardens at the surface
3
Q
How do you identify coarse-grained
A
slow cooling, large crystals
Usually three colors in a jigsaw
4
Q
How do u identify Fine-grained:
A
rapid cooling, small crystals
Usually one color
5
Q
How do u identify glassy rocks
A
very rapid cooling, very small crystals
6
Q
How do u identify Porphyry, rocks
A
different rates of cooling, varied sized minerals - usually 2 colored
7
Q
How do u identify Phenocrysts, rocks
A
large chunks
