Doğan Ergün
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The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs

Geology IN: Order of Geologic Events

Applying basic geologic principles: Laws of original horizontality, superposition, and cross-cutting arelationships explain the order o.