The cooling of lava running down a mountain contributes to the formation of rock where rocks melt underground to form magma.
The process that contributes to the formation of rock at point R, where rocks melt underground to form magma, is the cooling as the lava runs down the mountain. When magma reaches the surface and cools rapidly, it solidifies into extrusive igneous rock. The rapid cooling results in rocks with fine textures, which aligns with the cooling process as lava runs down the mountain.
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