The Earth's Grand Canyon took millions of years to carve, but the moon's grand canyons took about ten minutes.

Ryan Crow of the U.S. Geological Survey (USGS) gave a talk to a packed crowd at the Museum of Northern Arizona Jan. 12 ...

NAVAJO NATION - A federal judge rejected a motion from the Arizona State Legislature to remove the National Monument protection on parts of the Grand Canyon on Monday. It was an effort by the ...