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 ...
P-waves has the greatest speed and appears first on seismograms. S-Waves (S stands for secondary or shear or shake). Also known as transverse waves, because particle motions are transverse to the direction of movement of the wavefront, or perpendicular to the ray.