XIV

Geological resistance is: a measure of how well minerals resist erosive factors. And is based primarily on hardness, chemical reactivity and cohesion. The more hardness, "less reactivity." And more cohesion a mineral has, the: less susceptible it is——to erosion. Over time, differences in geological resistance in the——same geological formation can lead——to the formation of columns and "arches," like those in Moab, Utah; and of bridges, like Utah's Rainbow Bridge.

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