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The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).
S Waves. The second type of body wave is the S wave or secondary wave, which is the second wave you feel in an earthquake. An S wave is slower than a P wave and can only move through solid rock, not through any liquid medium. It is this property of S waves that led seismologists to conclude that the Earth's outer core is a liquid.