สายบัฌ 9 S Secondary wave 74 Sedimentary rock 75 Shadow zone 76 Shale 77 Siltstone 78 Silurian 79 Smoky quartz 80 Strain 81 Stratigarphic paleontology 82 Stratigraphy 83 Stress 84 Strike-slip fault 85 Subduction zone 86 Surface waves 87 Syncline 88