geology : Idioms & Phrases
economic geology
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noun the branch of geology that deals with economically valuable geological materials
WordNet
micro-geology
Mi`cro-ge*ol"o*gy noun
Etymology
Definitions
The part of geology relating to structure and organisms which require to be studied with a microscope.
Webster 1913
mining geology
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noun the branch of economic geology that deals with the applications of geology to mining
WordNet
petroleum geology
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noun the branch of economic geology that deals with the occurrence and exploitation of oil and gas fields