6. what are formations that hold water underground?

answer:

a unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. the depth at which soil pore spaces or fractures and voids in rock become completely saturated with water

explanation:

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answer: aquifer

explanation: an aquifer is a layer of water-bearing permeable rock underground, consisting of unconsolidated materials (gravel, sand, or silt) the water can be extracted by using a water well.

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switch around #3 and #4

explanation:

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