help with geology
make a dichotomous key using these rocks:
rhyolite
granite
andesite
diorite
basalt
gabbro
peridotite
obsidian
scoria
pumice
tuff
sandstone
shale
conglomerate
coal
halite
gypsum
chert
coquina
slate
mica schist
gneiss
marble
quartzite
Phyllis
migmatite
13 years ago 3
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