Relative composition of the upper and lower crust


Question:

Suppose magma in c after leaving the mantle crystallizes plagioclase between 1500° and 1400° C in the lower crust and the magma rises to the upper crust leaving the plagioclase behind. What effect will this have on the relative composition of the upper and lower crust.

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Other Subject: Relative composition of the upper and lower crust
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