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 ...
1. A long narrow upper section or crest: the ridge of a wave. 2. a. A long, narrow, elevated section of the earth's surface, such as a chain of hills or mountains or the divide between adjacent valleys. b. A long mountain range on the ocean floor. 3.