Plate Tectonics

Why does felsic lava tend to form composite volcanoes?

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January 25, 2009 10:27PM

Volcanic eruptions range from explosive to quiet depending on

the viscosity of the magma & the amount of dissolved gases.

Felsite volcanoes are the most viscous & the most explosives.

The explosive products from a volcano are called pyroclastic rocks.

Thus the most explosive volcano are those whose composition is

felsitic.This viscous felsite may plug the vocano, causing the

pressure to build within it. When the pressure becomes great, an

explosive eruption will occur. That is how composite volcoanos are


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