Scientists solve mystery of Meteor Crater's missing melted rocks

Scientists have discovered why there isn't much impact-melted rock at Meteor Crater in northern Arizona.
The iron meteorite that blasted out Meteor Crater almost 50,000 years ago was traveling much slower than has been assumed, University of Arizona Regents' Professor H. Jay Melosh and Gareth Collins of the Imperial College London report in the cover article of Nature (March 10).