How do pieces of rock in contact with a stream bed move?

Question:

How can pieces of rock in contact with a stream bed move?

A. bouncing, suspension, twisting rolling, sliding
B. suspension rolling, sliding, dissolution bouncing
C. sliding, dissolution rolling
D. sliding, bouncing

Answer:

C. sliding, dissolution rolling

Explanation:

A piece of rock in contact with a stream bed must be a heavy piece of rock and large weight size rocks move by sliding, full or partial dissolution, and rolling.

Final answer:

Pieces of rock in contact with a stream bed can move by bouncing, suspension, rolling, and sliding. These processes form part of the cycle that includes weathering, erosion, and deposition, shaping the Earth's surface and forming sedimentary rocks.

Explanation:

Pieces of rock in contact with a stream bed can move in several ways. The correct answer to the question is A. bouncing, suspension, twisting rolling, sliding. These methods describe the physical processes involved in the transportation of sediment in a stream. Bouncing or saltation involves rocks being lifted by the water current and then falling back to the stream bed. Suspension refers to sediments being held in the water column as they are carried downstream. Rolling and sliding occur when rocks move along the bottom of the stream bed. This continual movement and deposition form unique sedimentary structures, such as cross-bedding, which informs geologists about past water or wind directions. These processes are part of the larger cycle of weathering, erosion, and deposition that shapes Earth's surface and forms clastic sedimentary rocks.