In a(an)_____ aquifer water rises above the top of the aquifer when a drill penetrates it.

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In an artesian aquifer, water is under pressure due to the confinement of impermeable layers above and below the aquifer. When a drill penetrates the aquifer, the water can rise above the top, creating a flowing well or artesian well. This is different from a spring (B) where water naturally flows to the surface without the need for drilling, an erupting (C) aquifer which would be a rare occurrence of water bursting to the surface, or a dry (D) aquifer where no water is present.

In A(an)_____ Aquifer Water Rises Above the Top of the Aquifer