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.
Seismic Waves. When you toss a pebble into a pond, it creates radiating waves in the water. An earthquake does the same thing with energy. When the plates fracture or slip, energy is released as seismic waves [source: USGS ]. There are several types of seismic waves. Body waves move through the inside of the Earth. There are two types of body waves: Primary waves (or P waves) are the fastest moving waves, traveling at 1 to 5 miles per second (1.6 to 8 kilometers per second). They can pass through solids, liquids and gases easily.