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a wave vibrating at right angles to the direction of its propagation.

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A cresy is the point on a wave with the maximum value or upward displacement within a cycle. ... A point on the wave is a trough if the displacement of the medium at that point is at a minimum.

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A trough is the opposite of a crest, so the minimum or lowest point in a cycle.

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An oscillation, or repeating back-and-forth motion, about an equilibrium position.

# data[].attributes.body
A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.