What Can Cause Water to Separate from a Water-Bearing Basaltic

question 23

Multiple Choice

What can cause water to separate from a water-bearing basaltic magma to drive an eruption?

• A) Injection of dry rhyolite magma into the basalt magma chamber from below can cause water to separate.
• B) A decrease in pressure as the magma rises can cause water to separate.
• C) Water streaming up into the magma chamber from the Earth's mantle can cause this.
• D) Once water gets into a basalt magma, it can't separate.
• E) Basalt magmas only erupt as lava flows; water is irrelevant.

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