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What is the peak of a finger wave?

  1. Ridge

  2. Trough

  3. Crest

  4. Wavelet

The correct answer is: Ridge

A finger wave is a popular hairstyle from the 1920s that involves creating "waves" in the hair by shaping it with your fingers. The peak of a finger wave is the highest point of the wave, also known as the ridge. The trough, crest, and wavelet are all terms used to describe different parts of a wave, but they do not pertain specifically to a finger wave. Therefore, A is the best answer.