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The science comprising the study of the rocks Earth is composed of, and the processes by which they change. Some subfields of geology are petrology, mineralogy, and geophysics.

I don't know if geology tag should be included practically always or practically never when we are doing stratigraphy, structural-geology, tectonics....

Always I guess?

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Not always. Question related to oceanography, geography, climate and atmospheric sciences are often completely unrelated to geology.

You have to look to the most specific tags that represents a question. And quite often a tag as general as will fall off the maximum limit of 5 tags.

For example a question about how subduction zone can create an antactic mountain range could be tagged with , but you should use first more specific tags like , , , , , and by this point can't add any more tags. Consequently, very general tags like , are often used only in very general questions.

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