题目内容
Which element is the most abundant one in the crust (by weigh)?
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Silicate minerals are the most common type of minerals,
Metamorphism can also be divided into prograde and retrograde metamorphism
Metamorphic grade: is a general term for describing the relative temperature and pressure conditions under which metamorphic rocks form.
Metamorphic facies is a given set of metamorphic conditions,
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