This March 31, 2018, file photo provided by researcher A. Park Williams shows the Catalina Mountains in southern Arizona. (A. Park Williams/Lamont-Doherty Earth Observatory via AP)
Featured Photo Galleries
This March 31, 2018, file photo provided by researcher A. Park Williams shows the Catalina Mountains in southern Arizona. (A. Park Williams/Lamont-Doherty Earth Observatory via AP)
