Marine deposits are formed when diamonds are carried by rivers or streams to the ocean floor or shoreline.

Marine deposits are formed when diamonds are carried by rivers or streams to the ocean floor or shoreline.

• A. They form in oceanic crust
• B. False
• C. True
• D. They are created by human mining

Answer: (C)

Diamonds reach the sea through rivers and streams and then settle out as placer deposits when currents slow on the seafloor or along the shoreline. Because diamonds are extremely dense and resistant to weathering, they can travel with the sediment and accumulate in beach and offshore sands where the energy drops, forming marine diamond deposits. This capture-and-settle process in the marine environment is why the statement is true. It’s not formed in oceanic crust, and diamonds aren’t created by human mining—mining extracts diamonds that already exist, often from these natural marine or near-shore placer pockets.

Diamonds reach the sea through rivers and streams and then settle out as placer deposits when currents slow on the seafloor or along the shoreline. Because diamonds are extremely dense and resistant to weathering, they can travel with the sediment and accumulate in beach and offshore sands where the energy drops, forming marine diamond deposits. This capture-and-settle process in the marine environment is why the statement is true. It’s not formed in oceanic crust, and diamonds aren’t created by human mining—mining extracts diamonds that already exist, often from these natural marine or near-shore placer pockets.