The SRL Volcano Exhibit Radar images of various volcanoes taken from space. GIF format pictures and accompanying text good for reports and presentations. Back to Top Click on any of the vocabulary words below to hear them pronounced and used in a sentence. A theory of global dynamics having to do with the movement of a small number of semirigid sections of Earth s crust, with seismic activity and volcanism occurring at the margins of these sections. A geologic process in which one edge of one crustal plate is forced below the edge of another.
Subduction occurs when one plate moves under another.
A hole in a volcanic area from which hot smoke and gases escape. Trapped water in volcanoes is turned into steam. Jets of it spew through holes called fumaroles. Bulges in the Earth s surface are outward signs of swelling in the magma chamber. The movement is called ground deformation and is measured by surveying the landscape s tilt.