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The volcanoes in the Andes are generally fed by very viscous, gas-rich magma. The gas is kept dissolved in the magma under enormous pressure. When the magma is close enough to the surface the lower pressure allows the gasses to come out of solution violently. This is what makes these eruptions explosive.

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Q: Why are volcanoes in the Andes so violent?
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Related questions

How many volcanoes are in the Andes?

there are 50 volcanoes


Are there volcanoes in the Amazon?

No. Howevere, there are volcanoes in the Andes to the west of the Amazon.


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