In 1990, a group of geologists discovered a large number of shatter cones in southwestern Montana. Shatter cones are a type of metamorphosed rock often found in impact structures (the remains of a crater after a meteor impact and years of Earth activity). Scientists have discovered only 168 impact craters around the world. If rocks could talk, they would be able to tell the story of the events that formed them. But because they can't, geologists must use rocks as clues to reconstruct Earth's history. For this science exploration, we began by discussing some of the very questions geologists sought to answer at the Beaverhead, Montana, site. Beyond the shatter cones, there was no visible evidence of a meteor crater. Geologists wondered: How big was the impact crater? Where was the actual impact center? How long ago did the impact occur? Why can't you see a crater today?