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Once formed, a magma body buoyantly rises toward the surface because it is less dense than the surrounding rocks.
As a magma body cools, the size and number of crystals increase.
During the last stage of cooling, a magma body is like a "crystalline mush" (resembling a bowl of very thick oatmeal) that contains only small amounts of melt.
When deeply buried magma bodies crystallize, the remaining volatiles collect as hot, water-rich fluids that migrate through the surrounding rocks.
When a magma body cools, the silicon and oxygen atoms link together first to form silicon-oxygen tetrahedra, the basic building blocks of the silicate minerals (see Figure 3.31, page 92).
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