"Several generations of Southerners claim the Lynyrd Skynyrd song, "Sweet Home Alabama," as their anthem. The Billie Holiday hit "Stars Fell on Alabama" is another, and though an actual star didn't fall on Alabama, the state is the only place on Earth where a person has been injured by a meteorite. Another impact, this one about 80 million years ago, left the 5-mile-wide Wetumpka impact crater in the center of the state. Alabama's world-class geology,...