18.2 Notes: Volcano Anatomy Main Idea 1: Volcanoes look like mountains, but they form as a result of...
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18.2 Notes: Volcano Anatomy Main Idea 1 : Volcanoes look like mountains, but they form as a result of repeated eruptions of magma from underground. Redoubt, AK
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Transcript of 18.2 Notes: Volcano Anatomy Main Idea 1: Volcanoes look like mountains, but they form as a result of...
18.2 Notes: Volcano Anatomy
Main Idea 1: Volcanoes look like mountains, but they form as a result of repeated eruptions of magma from underground.
Redoubt, AK
Gas
Explain:The high pressureof magma can keep gases dissolved. As magma leaves volcano, pressure decreases, gas is released.
Lava
Define: Magma thatis released above the ground.
Influence of Silica Content: Silica determines the viscosity; more Si increasesviscosity & slows lava flow.