Meteor Crater, the best-preserved impact crater on Earth, is about 500 feet deep and a mile in diameter.
The Grand Canyon is about 20 miles
across, a mile deep, and 200 miles long.
The Grand Canyon is always changing,
especially the shadows and the clouds in it.
One could gaze into the Grand Canyon all
day.
The Painted Desert, near Tuba City,
Arizona
Bryce Canyon, Utah
Wilson Arch, near Moab, Utah
The Pluto Discovery Telescope, at
Lowell Observatory, Flagstaff, Arizona. Clyde Tombaugh used this 13-inch
astrograph to discover Pluto in 1930.