This substance can be classified, depending on the smoothness of its surface, as a'a (AH-AH) or pahoehoe (pah-HOY-HOY).
A "pillow" form of this substance forms underwater. "Domes" of this substance form from andesite. This substance can be classified, depending on the smoothness of its surface, as a'a (AH-AH) or pahoehoe (pah-HOY-HOY). It accumulates around a vent to form a cinder cone, and it solidifies to form igneous rock. For 10 points, give the term for magma that reaches the Earth's surface, often through a volcanic explosion.
A "pillow" form of this substance forms underwater. "Domes" of this substance form from andesite.
lava