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lava formed the volcanic mountains
A mountain formed by hardened lava.
they are made of volcanic rock and lava ( hardened of course!)
Lava
It would have to be a volcano rock because the heat and magma hardens it and make it into a igneous rock. So when the volcano explodes it explodes with the magma. So when the magma heats and hardens it transforms into an Igneous rock.
Igneous rock is formed from lava that has cooled and, of course, hardened.
Igneous rocks
extrusive igneous rock
volcanic lava
igneous
lava
A volcano is formed when the molten magma (lava) beneath the crust is forced to the surface. Volcanic rock is lava that has cooled.