There are two types of body waves: compressional (P) waves and shear (S) waves. Primary waves (P-waves) travel the fastest, so they arrive at the recording station (seismograph) first. Secondary or shear waves (S-waves) travel slower than P-waves so they arrive second.
Modified frequency modulation (MFM) is an encoding scheme used by PC floppy disk drives and older hard drives.
Methylsulfonylmethane (MSM) is a sulfur compound that naturally occurs and it is a nutritional component found in food. Read MSM uses, side effects and working. Methylsulfonylmethane (MSM) is a sulfur compound that naturally occurs and it is a nutritional component found in food.