Rocks are being weathered when a. acid rain causes features of buildings and statues to become more rounded and less detailed. b. tree roots force their way into small openings, and pieces of the rock break off as the roots make the openings larger. c. water freezes and thaws inside small cracks, causing pieces of rock to break off. d. all of these

D. All of these

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when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave