Grand Canyon 大峽谷

Though the theory is still up for debate, experts think this colossal canyon was formed 17 million years ago, when the Colorado River carved through the gorge, eroding the rock. A breathtaking 277 river-miles long, 18 miles wide and a mile deep, the famous landmark drew just under 4.5 million visitors in 2009. Photo by Shutterstock.

盡管理論尚處于爭論之中，但專家們認為這條巨大的峽谷是一千七百萬年前，科羅拉多河流橫穿峽谷腐蝕巖石而形成的。有著令人驚嘆的277英里的河長、18英里的寬度和1英里的深度，這處著名的景觀2009年吸引了接近450萬人次的游客。由 Shutterstock拍攝。

來源:可可英語 http://www.ccdyzl.cn/read/201008/112674.shtml