shadow+zones

=Shadow Zones=

===P and s waves travel very differently though the earth, although s waves cannot travel through the liquid outer core of the earth. Shadow zones are locations on the earth's surface where no body waves from a particular earthquake can be detected. The shadow zone is the area of the earth from angular distances of 105 to 140 degrees from a given earthquake that does not receive any direct p waves. When seismic waves are traveling through materials of different rigidities, the speed of the waves changes and also bend in different directions. P waves can travel through all layers, the speed and direction of the waves change as the waves pass through different layers. ===