Placer deposits form when ____.
A. hot, metal-rich fluids cool underground
B. heavy eroded particles settle out of moving water
C. organic matter is compressed over millions of years
D. magma cools in underground chambers
Answer (3)
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.
**Placer deposits **form when heavy **eroded particles **settle out of moving water. Therefore, **option B **is correct.
Placer deposits are valuable **mineral accumulations **found in the beds of rivers, streams, or other water bodies. They form through the process of erosion, where **rocks **and minerals are weathered and broken down into smaller particles.
As water moves and flows, it transports these heavy particles, such as gold, silver, or gemstones, along with it. When the water slows down, like in riverbeds or behind obstacles , the heavy particles settle and become concentrated in specific areas.
Miners historically extracted valuable minerals from placer deposits through techniques like panning, sluicing, and dredging .
Therefore, **option B **is correct.
Learn more about **Placer deposits **here:
https://brainly.com/question/13868961
#SPJ6
The correct answer is: heavy eroded particles settle out of moving water. Placer deposits are formed through the erosion, transport, and settling of heavy minerals by flowing water. This natural concentration process is significant in mining valuable minerals like gold.
;
