Geology deals with the rocks of the earth's crust. Itlearns from their composition and structure how the rockswere made and how they have been modified. It ascertainshow they have been brought to their present places andwrought to their various topographic forms, such as hillsand valleys, plains and mountains. It studies the vestigeswhich the rocks preserve of ancient organisms which onceinhabited our planet. Geology is the history of the earthand its inhabitants, as read in the rocks of the earth's crust.
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