Question

question 7 1 pts crystal fractionation occurs when _______________. silicate crystals fall out of the magma making it more iron rich iron and magnesium crystals fall out of the magma making it more silica rich high silicate minerals melt at lower temperatures silicate rich rocks are added to the magma

Explanation:

Crystal fractionation is a process in igneous petrology. When iron - and magnesium - rich minerals (mafic minerals) crystallize first and fall out of the magma, the remaining magma becomes more silica - rich. This is because the early - crystallizing minerals remove iron and magnesium from the magma, changing its chemical composition.

Answer:

iron and magnesium crystals fall out of the magma making it more silica rich