Question

a volcanic eruption begins when pressure on the magma chamber forces magma up through the conduit and out the volcanos vent

whats it called?​

Answer 1

Answer:

As gas bubbles rush up the magma conduit, the pressure declines, causing the bubbles to expand rapidly. ... The rapid expansion of gas bubbles propels the magma and gas up the conduit. Within minutes, the volcano erupts, explosively spewing hot lava and tephra into the air.

Answer 2

Answer:

Magma Conduit. With the accumulation and rise of bubbles through the magma chamber, the pressure increases and will eventually become great enough to break through overlying roof rocks, creating a conduit to the surface. Magma escapes through the “super highway” of the volcano, known as the magma conduit or throat.