Today I Learned . . .
1. An artesian well occurs when water enters a porous geologic structure (like sand, gravel, sandstone, limestone) that is trapped between two layers of an impermeable geologic structure (like a clay or shale). Water enters the porous geology at a higher elevation. It flows downward, and at a lower elevation, can not escape do to the impermeable layers that trap it. If a well is drilled into this porous geologic structure, the gravity pressure can be sufficient for the water to erupt from the ground without mechanical pumping.
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