Springs

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Two cases of springs: “In one, the water descends through the porous bed e to the layer d, which is relatively impervious. The water flows along this layer until it comes to the surface, and there the water flows out as a spring, s’. In the other, the water moves underground through the porous layer b, under pressure, until it reaches a crack which leads up to the surface...s.” -Salisbury, 1919

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Springs

Source

Rollin D. Salisbury American Science Series - Advanced Course: Physiography (New York, NY: Henry Holt and Company, 1919)

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