题目内容

What kind of phenomena is the following expression described. It is the characteristic of a chemical substance to crystallize in more than one form under different conditions, such as graphite and diamond. Both graphite and diamond are composed of carbon, but they have different crystal structures and thus have different characteristics. For example, graphite has layer structures and thus is very soft, while diamond has framework structures and thus is the hardest mineral on Earth.

A. Polymorphism
B. Isomorphism

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