There's a reason they call the lands surrounding the North Pacific the "Ring of Fire," and no, it's not because of a Johnny Cash song. No, the reason for that appellation is that the northern coasts of the lands on the Pacific are hotbeds of tectonic and volcanic activity. Nowhere are Americans more aware of this than in California, which has been hit by some pretty serious temblors in the past. Now, it looks like another big one may be on the way. Geologists are looking at the San Andreas and San Jacinto faults, and they are a tad worried...