Which statement best explains that sound waves are pressure waves?
a. sound waves have regions of compressions and rarefactions.
b. sound waves cannot propagate through metals.
c. sound waves move perpendicular to the medium particles.
d. sound waves cannot propagate through water.

Hello there!

First, sound waves can propagate in any material, so options b and d can be discarded.

Sound waves propagate in spherical waves from the source, not in a perpendicular way, so this discards the option c.

Now, "sound waves have regions of compressions and refractions" is the right answer, these regions of compression and refraction are regions where the pressure changes, which is the thing that explains why sound waves are pressure waves.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d