Geology is, broadly speaking, the study of the Earth. It is split into several disciplines, including: Petrology (the study of rocks), Geophysics (the study of the Earth using physics), Palaeontology (the study of fossils) and Mineralogy (the study of minerals). The main aim of geology is to understand how the Earth works; how mountains are built, how the oceans form, what dinosaurs looked like. The Earth is constantly changing, both inside and outside.
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