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5 Cards in this Set

  • Front
  • Back
Intrusive (plutonic)
From underground
Solidification of magma
Cool slowly
Crystals have time to grow large
Coarse- grained texture
Extrusive (volcanic)
Form at surface
Solidifcation of lava
Cool quickly
Crystals do not have time to grow large.
Fine-grained texture
Felsic Magma
Thick and slow
Large amounts of silica (Si,O)
Less dense
More Al and Na
Lighter in color
Mafic magma
Hotter, thinner, and more fluid
Lower amounts of silica
Denser
More Fe and Mg
Darker in color
Basalt
1. Darker color
2. High specific gravity
3. Fine grained
4. Forms at the surface, principally in the ocean basins but also in isolated "hot spots" on the continents.