3. p waves travel faster than s waves, and are the first waves recorded by a seismograph in the event of a disturbance. p waves travel at speeds between 1 and 14 km per second, while s waves travel significantly slower, between 1 and 8 km per second.
4. seismic waves, the waves of energy that travel through earth as a result of an earthquake can tell us a lot about the internal structure of the earth because the waves travel at different speeds in different materials. there are two types of waves that travel through the earth: p waves and s waves.
The answer is B <span>Endocrine system </span>
But it was not until 1928 that penicillin, the first true antibiotic, was discovered by Alexander Fleming, Professor of Bacteriology at St. Mary's Hospital in London.
a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.
