Hourly Weather - Riverview, Canada

Balanced Rock in Utah's Arches National Park stands 128 feet tall. Scientists say rocks like this, including much more mundate versions, could be key to predicting earthquakes. (NPS/Kait Thomas) At a Glance Precariously balanced rocks, or PBRs, have been a focus of earthquake research for decades.A new study says they can be used to create more accurate hazard models.Such models are used by planners, engineers and insurance companies to gauge quake risk. In rocky terrain, it's not unusual to see...