Unit 10 - Grand Canyon National Park Grand Canyon Scenery (photos by R. Alley) The Great Unconformity

Unit 10 - Grand Canyon National Park NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team Satellite-generated oblique view of the Grand Canyon, looking across the South Rim Village (lower right, yellow label “S”) toward North Rim Village (“N”). S N

Unit 10 - Grand Canyon National Park USGS Landsat image. At 277 miles long, 5 to 18 miles wide (average 10 miles wide), and about 5700 feet deep (just over a mile), Grand Canyon is not the longest, deepest, widest or steepest on Earth, but it may be the grandest for combining length, depth, width and steepness. South Rim Village (S) and North Rim Village (N) are indicated. S N

Unit 10 - Grand Canyon National Park National Park Service Historical Photo, helicopter-rescue training exercise. National Park Service web site says: “Over 250 people are rescued from the Canyon each year. The difference between a great adventure in Grand Canyon and a trip to the hospital (or worse) is up to YOU - follow the rules of smart hiking and - DO NOT attempt to hike from the rim to the river and back in one day, especially during the months of May to September.”

Unit 10 - Grand Canyon National Park Left to right, CAUSE students Stephanie Shepherd, Dave Witmer, Sameer Safaya, Sam Ascah and Irene McKenna, at Silver Bridge after moonlight hike to the bottom of the Canyon. Geography staff member Anna Brendle and videographer Topher Yorks Raya Guruswami and Sam Ascah Some who didn’t need help hiking to the bottom of the canyon and back.

Unit 10 - Grand Canyon National Park Mule deer in feeding trough for pack mules, and Columbian ground squirrel, Indian Gardens, Grand Canyon.

Unit 10 - Grand Canyon National Park California condors have been reintroduced to the Canyon successfully. It is a pleasure to see them wheeling above the vast spaces.

Unit 10 - Grand Canyon National Park Prickly pear (upper left), phlox (left), century plant (above), and penstemon (above right). Despite the dryness, the Canyon has many beautiful flowers.

Unit 10 - Grand Canyon National Park South Bright Angel Trail (left), and having a little fun with it (right).

Unit 10 - Grand Canyon National Park Metamorphosed rocks abraded and polished by Colorado River, Bright Angel Trail. Note that river-worn rocks look very different from glacier-worn rocks, but show clear evidence of erosion.

Unit 10 - Grand Canyon National Park Sunset at the Canyon. It is worth the trip…