CK-12 Physical Science - For Middle School

19.1. Characteristics of Waves http://www.ck12.org

FIGURE 19.2

In a transverse wave, the medium moves at right angles to the direction of the wave.

FIGURE 19.3

Crests and troughs are the high and low points of a transverse wave.

way are called secondary, or S, waves. An S wave is illustrated inFigure19.4.

FIGURE 19.4

An S wave is a transverse wave that trav-

els through rocks under Earth’s surface.