which occurs just before a volcanic eruption? lava flows onto the sides of the volcano. the expanding gases…

which occurs just before a volcanic eruption? lava flows onto the sides of the volcano. the expanding gases push magma through the pipe. a pocket of magma forms beneath the volcano. new rocks are formed as lava hardens.

which occurs just before a volcanic eruption? lava flows onto the sides of the volcano. the expanding gases push magma through the pipe. a pocket of magma forms beneath the volcano. new rocks are formed as lava hardens.

Answer

Brief Explanations:

Before a volcanic eruption, expanding gases build up pressure and push magma through the volcanic pipe to the surface. Lava flowing onto the sides is during the eruption, a pocket of magma forms much earlier in the volcanic - building process, and new rocks forming from lava hardening is after the eruption.

Answer:

The expanding gases push magma through the pipe.