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JulijaS [17]
4 years ago
15

Why is expansion of rock important for magma to form?

Geography
1 answer:
Eddi Din [679]4 years ago
8 0
The melting temperature of materials is affected by the pressure they are under. So when "rock" in the Earth's mantle experiences a decrease in confining pressure, not only does it expand, it's melting temperature drops. If the melting temperature of the material drops below the background (also known as the
in-situ
) temperature, then melting will occur and in this case magma will form.
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