About 90 percent of the world’s earthquakes strike inside the “ring of fire,” which is a 25,000 mile stretch of ocean trenches and volcanoes. Haiti’s earthquake was rare, but expected. Ben Tracy reports.

cbshaiti,earthquake,haiti,Aftershock,Earth,Quake,Tremor,Richter,Scale,Science,California,7.0,U.S.,Pacific,Ring,Fire,Rim,Coast,Disaster,Crisis,Emergency,Ocean,Plate