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Steve Igneous

-melted rock (minerals) called magma

-can come from volcanoes

-can be under the ocean

-near tectonic plate edges

under the ocean or on the surface

volcanoes

magma

no fossils

Intrusive

gabbro

Granite

hardens under the earths surface

cool slowly

course or large crystals

plate seperation ridges

several minerals

no layering

no acid reaction

extrusive

Ryolite

obsidian - volcanic glass

called lava when on the surface

came from a volcanoe or large cracks

"holey"

cools quickly

small crystals

often dark