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2 February, 15:19

One way magma can form is from:

A. an increase in pressure along a rift valley

B. a decrease in the amount of water which can occur at subduction boundaries

C. an increase in temperature such as over a hot spot

D. A decrease in temperature such as an Iceland

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  1. 2 February, 18:00
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    C is the answer, Magma is formed by hot spots in the mantle when hot material undergoes decompression, melting as it rises.
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