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⁣When a volcano is blocked, the pressure inside it keeps rising because magma is constantly pushing upward. Magma is hot, fluid rock filled with gas, and it cannot stay still when pressure builds. If its normal opening is closed, the magma spreads through the weaker parts of the surrounding rock. It ...

⁣When a volcano is blocked, the pressure inside it keeps rising because magma is constantly pushing upward. Magma is hot, fluid rock filled with gas, and it cannot stay still when pressure builds. If its normal opening is closed, the magma spreads through the weaker parts of the surrounding rock. It ...