Question

what is crust and trouch

Answer 1

Waves have moving crests (or peaks) and troughs. A crest is the highest point the medium rises to and a troughis the lowest point the medium sinks to. Crests and troughs on a transverse wave
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Answer 2

hey..

1.CREST...or PEAK...upper portion of the curve..COMPRESSION

2.TROUGH...or VALLEY...lower portion of the curve..RAREFACTION.