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Magma is not all that abundant. The mantle itself is solid due to the pressure it is under. When magma comes in contact with solid rock, some of that rock may melt, but it takes a lot of heat to melt rock. Once it reaches the melting point, more energy is needed to actually melt it. Additionally, rock does not transfer heat easily. The sheer volume of the rock also keeps the entirety of it melting. It is like pouring a bucket of water on a glacier.

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11y ago

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