题目内容
This phenomena is the characteristic of two or more crystalline substances to have similar chemical composition, axial rations and crystal forms, and to crystallize in the same crystal class, such as olivine in which Mg and Fe take the same positions in crystal structure. What is the phenomena described by the above paragraph?
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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.
Would you expect all the crystals in an intrusive igneous rock to be the same size?
According to the periodicity and activity, volcanoes can be classified into:
All plant and animal life on our planet Earth belongs to:
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