<p><strong>Fig. 4.3.</strong> Diagram showing two views of waves. The side view (<strong>A</strong>) shows a wave profile with several crests and troughs. The top view (<strong>B</strong>) shows the same waves with vertical lines representing the wave crests traveling in the direction represented by an arrow.</p>

Fig. 4.3. Diagram showing two views of waves. The side view (A) shows a wave profile with several crests and troughs. The top view (B) shows the same waves with vertical lines representing the wave crests traveling in the direction represented by an arrow.

Image by Byron Inouye