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.
Body waves. Body waves are of two types: compressional or primary (P) waves and shear or secondary (S) waves. P-and S-waves are called body waves because they can travel through the interior of a body such as the Earth's inner layers, from the focus of an earthquake to distant points on the surface.he seismic waves created as they move from the epicentre an earthquake vary. What is amazing is how fast they can travel: up to 2 miles per second in granite! Seismic waves can be classified into two basic types: body waves which travel through the Earth and surface waves, which travel along the Earth's surface.