Chlamydia is one of the most common STDs, particularly among college-aged men and women. Fortunately, unlike in the old days, it's now quite easy and painless to get tested and treated for a chlamydia infection. In recent years, tests have been developed that can detect chlamydia and be completed in just a few hours.
Seismograms A, B, C, and D. show, in Greenwich time, the arrival times of the. earthquake waves at the four stations. The P-wave generated by this earthquake took 2 minutes. and 40 seconds to reach one of the seismic stations.
1 For our example, the distance is 9030 km, and the time is 721 s. 2  The calculated velocity is 12.5 km/s. 3  Calculate the average velocity of the seismic waves from all of the earthquakes in your data table (which should all be roughly in the same area of the world).