What role do water and other volatiles play in the formation of magma?

What will be an ideal response?


Water and other volatiles act as salt does to melt ice. Water causes rock to melt at lower temperatures. At a depth of about 100 kilometers, the addition of water lowers the melting temperature of mantle rock sufficiently to trigger partial melting.

Environmental & Atmospheric Sciences

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A) Geopolitics B) International geography C) Globalization D) Geo-foreign policy

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Most andesitic volcanoes are located

A. along a transform fault. B. at a divergent plate boundary. C. above a mantle hotspot. D. at a convergent plate boundary.

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How do stalactites, stalagmites, columns, drip curtains, and travertine terraces form? What will be an ideal response?

Environmental & Atmospheric Sciences