Which term describes an igneous rock that forms quickly on earth's surface from cooling lava?
a: intrusive
b: plutonic
c: extrusive
d: clastic

C: extrusive

Extrusive rocks are a type of igneous rock that form at the crust's surface as a result of volcanic activity.

Intrusive and plutonic form below the earth's surface.  Clastic are sedimentary rocks.

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