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.
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A) CFCs B) greenhouse gases C) nitrogen oxides D) sulfur oxides E) acid deposition
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A) Geopolitics B) International geography C) Globalization D) Geo-foreign policy
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.