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Glossary

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Ultramafic Rock

A rock composed primarily of mafic minerals (Mg, Fe silicates), including the rocks dunite peridotite, and pyroxenite.

Unmodified Slope

A slope that has evolved naturally without any significant alteration by humans (includes timbering and farming, which are not considered significant slope modifying activities).

Uplift

A structurally high area in the crust, produced by upward movements that raise or upthrust the rocks, as in a dome or arch.