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