An antecedent is a word for which a pronoun stands. The pronoun must agree with its antecedent in number. Rule: A singular pronoun must replace a singular noun; a plural pronoun must replace a plural noun. Here are nine pronoun-antecedent agreement rules.
Best Answer: Wrong answer. Well trough is right. But peak is totally wrong. The crest is the highest point on a wave, while the trough, or valley between two waves ...
Quick Answer. The crest of a wave is the point of maximum positive displacement, or upward movement, away from equilibrium, or an undisturbed state. The opposite of crest is trough, which is the point of the greatest negative, downward displacement.