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silica-rich magma traps water and gas bubbles together which causes huge amount of pressure in the magma.

I found this on answers.com, "Silica-rich magma erupts by creating a high viscous magma, which result into releasing high pressurized gases, that cause eruption."
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Silica-rich magma traps water and gas bubbles together which causes huge amount of pressure in the magma.
Resources:
"Silica-rich magma erupts by creating a high viscous magma, which result into releasing high pressurized gases, that cause eruption."

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