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Answer
As magma rises, pressure , causing dissolved gases to expand and form bubbles. The size of the bubbles increases, exerting a lot of force. The force of the expanding gases pushes the magma from the up:
decreases
As magma rises, pressure , causing dissolved gases to expand and form bubbles. The size of the bubbles increases, exerting a lot of force. The force of the expanding gases pushes the magma from the up:
magma chamber
As magma rises, pressure , causing dissolved gases to expand and form bubbles. The size of the bubbles increases, exerting a lot of force. The force of the expanding gases pushes the magma from the up:
pipe
As magma rises, pressure , causing dissolved gases to expand and form bubbles. The size of the bubbles increases, exerting a lot of force. The force of the expanding gases pushes the magma from the up: