Grand Canyon
Grand Canyon is a steep-sided Canyon in the Colorado river in the stade of Arizona
The Grand Canyon is 277 miles long, up to 18 miles. 
The Grand Canyon area has some cleanest air in the United Stades, but however at times the the air times air quality cab be considerbly affected by events such as forest fires and dust storms in the Southwest.
Grand Canyon tourisim is one of the worlds most went to place, attracting about five million visitors per year.
About 600 death's has happened in Grand Canyon since the 1870s. Some of these deaths has accured in results of overly dangerous photoqraphers  and some of the fatalites are results of airplane collisions within the the canyon and some visitors drowned in the colorado river.
