The Racetrack. This is a clay playa where rocks move and leave trails behind them. It's believed this is due to a combination of strong winds and rain that push the rocks over the slick surface during storms. The Racetrack is 20-some miles down a road that wouldn't be passable during rain, so no one has actually seen this happen. The tracks stay for years.

The Racetrack. This is a clay playa where rocks move and leave trails behind them. It's believed this is due to a combination of strong winds and rain that push the rocks over the slick surface during storms. The Racetrack is 20-some miles down a road that wouldn't be passable during rain, so no one has actually seen this happen. The tracks stay for years.