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thomaster
 one year ago
Best ResponseYou've already chosen the best response.0Pwaves are primary waves and Swaves are secondary waves. PWaves are the first waves to arrive at the station where they measure earthquakes and they travel faster than Swaves.

Dean.Shyy
 one year ago
Best ResponseYou've already chosen the best response.0This may help: http://is.gd/IA7gIg
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