Lead-zinc deposits,like those along the Mississippi Valley,form when:

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Lead-zinc deposits are formed when deep groundwater that is rich in lead and zinc encounters buried hills of granite. The minerals are dissolved in the groundwater and then precipitate out when the water becomes saturated, forming deposits. The Mississippi Valley is known for these types of deposits, which are also called sedimentary exhalative deposits. Options A, B, and C are not correct as they do not accurately describe the formation of lead-zinc deposits.

Lead-Zinc Deposits,like Those Along the Mississippi Valley,form When