Plural of declivity; multiple steep slopes, downward gradients, or descents of terrain.
Plural of declivity, from Latin declivitas, from declivis meaning 'sloping downward.' The plural form is used when discussing multiple slopes.
Hikers and engineers use 'declivities' when mapping terrain because measuring the angle of steep slopes helps predict erosion, landslides, and how water will flow during heavy rain.
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