Don't worry, it was medicinal. Over on . The Tonight Show , Rachel Maddow stopped by to teach Jimmy Fallon how to make The Millionaire -- in honor of Donald Trump 's run for president. Best quote: I have to tell you, it is a terrible drink. It isn't tasty.
Seismic waves are waves produced by earthquakes. This occurs when rocks under the earth suddenly break or explode. There are two MAIN TYPES of seismic waves called body waves and surface waves. Body waves have the capacity to travel through the Earth's inner layers. They have a higher frequency and they are the ones that first occur under water at the onset of an earthquake.
Seismic waves are usually generated by movements of the Earthâs tectonic plates but may also be caused by explosions, volcanoes and landslides. Seismologists use seismographs to record the amount of time it takes seismic waves to travel through different layers of the Earth. As the waves travel through different densities and stiffness, the waves can be refracted and reflected.