S

Sahara Desert, 32 San Andreas Fault, 80 scientific method, 9 scientific revolutions, 7 seafloor spreading magnetic reversals and, 60-63 overview of, 55-57

questions about, 84 transform faults and, 82

secondary waves. See S-waves sedimentary rocks, 10, 13-14, 45

seismic waves, 65-66, 73

seismographs, 65-66 seismology, 65-69, 71-72

shear waves. See S-waves sial layer, 72-74 sima layer, 74 Snider-Pelligrini, Antonio, 23-25 sonar, 50-52 soundings, 49 Spitsbergen, 32 St. Helens, Mount, 76 subduction zones, 56, 77-78, 80 submarines, 51 submarine trenches, 54, 82

Suess, Eduard, 21, 23, 25 supercontinents, 23 S-waves, 66, 78

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