as silica concentration of magma increases . select one: a. content of dissolved gas in the magma increases b. viscosity of the magma increases c. viscosity of the magma decreases d. content of dissolved gas in the magma decreases

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21-10-2022
Geography

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as silica concentration of magma increases . select one: a. content of dissolved gas in the magma increases b. viscosity of the magma increases c. viscosity of the magma decreases d. content of dissolved gas in the magma decreases

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TNragavi22 TNragavi22 · Answer 1 · 2022-10-22T05:44:01+02:00

As the silica concentration of magma increases, the viscosity of magma

Option A is wrong because the increasing content of dissolved gas in the magma has no relation to silica concentration.

Option B is correct because silica increases the resistance of flow. It makes the volcano usually explosive.

Places with more destructive plate boundaries have partial melting of crustal rocks, which are richer in silica. Mt. St Helens is an example of a highly eruptive volcano.

Option C is wrong because if the silica concentration increases, the viscosity will also increase. It will not decrease.

Option D is wrong because the increase or decrease of the dissolved gases in the magma has no relation to the silica concentration.

Learn more about volcanos at,

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