If you print out the files, underline the passages that you feel are the most important. Use the web site titled ' Update on Current Volcanic Activity' to plot on a world map recent volcanoes. Describe a pattern in the arrangement of volcanoes around the Pacific Ocean. A conduit feeds magma to the surface. Near the surface, the gas expands and fragments the lava into ash.
Some magma passes through dikes to feed vents.
Some magma intrudes parallel to layers to make sills. When a region is clicked on, specifics come up. Customized Listing of Recent Arrival Times - Generate a listing of times that phases from recent earthquakes arrived at your seismic station. This is the graphical way to find web earthquake maps for the region you are interested in. Putting Down Roots in Earthquake Country - This document is based on the 'Putting Down Roots in Earthquake Country' handbook released to Southern Californians in October of 1995.