steady as she goes! meaning, steady as she goes! definition | English Cobuild dictionary. steady. 1 adj A steady situation continues or develops gradually without any interruptions and is not likely to change quickly. Despite the steady progress of building work, the campaign against it is still going strong...
Seismic waves are divided into two types: Body waves and surface waves. Body waves include P and S waves, and these are the two types of waves that are used to determine the internal structure of the Earth. (There are other types of seismic waves, but they relate to surface damage and only travel through the Earth s crust, not the entire Earth. If you are interested though, there is a short activity to show you what they are and how they move.
The two main types of waves are body waves and surface waves. Body waves can travel through the earth's inner layers, but surface waves can only move along the surface of the planet like ripples on water. Earthquakes radiate seismic energy as both body and surface waves. Body Waves. Traveling through the interior of the earth, body waves arrive before the surface waves emitted by an earthquake. These waves are of a higher frequency than surface waves.