Placer deposits form when (1 point)
hot, metal-rich fluids cool underground
heavy eroded particles settle out of moving water
organic matter is compressed over millions of years
magma cools in underground chambers

The correct answer is: heavy eroded particles settle out of moving water.
 Placer deposits form when heavy eroded particles settle out of moving water. Placer deposits naturally accumulate heavy, valuable minerals, which are formed by the gravitational effect during sedimentary processes. As a result, these minerals are concentrated in residual, beach and stream deposits thereby forming ore deposits.

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