the principal force driving movement in diffusion is

A mass movement that involves the sudden movement of a block of material is called a

A. rockfall.

B. slide.

C. slump.

D. flow.

In order to detect the movement of water in the ocean, oceanographers sometimes rely on the motional emf generated by this movement of the water through the magnetic field of the Earth. Suppose that, at a place where the vertical magnetic field is 7.0x10^-5 T, two electrodes are immersed in the water separated by a distance of 200 m measured perpendicularly to the movement of the water. If a sensitive voltmeter connected to the electrodes indicates a potential difference of 7.0x10^-3 V, what is the speed of the water?