Answer:
Primary waves, also known as P waves or pressure waves, are longitudinal compression waves similar to the motion of a slinky (SF Fig. 7.1 A). Secondary waves, or S waves, are slower than P waves.
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SF Table 7.1.
Mineral Basalt
P wave velocity (m/s) 5000-6000
S wave velocity (m/s) 2800-3400
Density (g/cm3) 2.7-3.1
