are formed by magma from the molten interior of the ... is much cooler than the mantle, the rock cools very quickly, so the mineral crystals are small. Granite hardens within the earth’s crust ...

Initially formed from molten rock, the crust cools and hardens, leading to the creation of mountains, valleys, and oceans. Erosion, driven by water, wind, and ice, gradually wears down the land ...

It shows the underground plumbing system that provides molten and partly molten rock to the magma chamber beneath the Mount Rainier volcano in Washington state. The scale at left is miles depth.