Final answer:
In a wave, troughs are the points of maximum compression, opposite of crests. Nodes have no motion, while antinodes have maximum motion.
Step-by-step explanation:
In a wave, points of maximum compression are called troughs. Troughs are the lowest points along a wave where the displacement of the medium is at a minimum. They are opposite of crests, which are the highest points along a wave where the displacement of the medium is at a maximum.
Nodes, on the other hand, are areas of wave interference where there is no motion. Antinodes are areas of wave interference where the motion is at its maximum point.