Which rock am I?
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marble
I am formed by metamorphism of limestone or dolomite.
shale
I am the most abundant sedimentary rock.
granite
I compose most of Earth's continental crust.
gabbro
I am a coarse-grained rock that composes a large portion of the oceanic crust.
limestone
I am a sedimentary rock that is at least 50% calcium carbonate.
obsidian
I am an amorphous rock that has been used for making simple knives, axes, arrowheads, and other tools and weapons.