Although there is no official list,the following are generally accepted as the Seven Natural Wonders of the World.In the United States Meteor Crater,also known as Barringer Crater, is a huge circular depression in the earth near Winslow, Arizona caused by a meteorite impact and the Grand Canyon is a breathtaking 450-km(280-mile) chasm created by the colorado River eroding the rook of the colorado plateau over about 6million years.Asia's Mount Everest, rising 8,850 metres (29,035 feet) above sea lever in the Himalayas, is the world 's highest mountain. In central Australia Uluru (Ayers Rock) rises 346 metres(1,141 feet) above the desert floor and off the east coast the Great Barrier Reef is the world's longest coral reef formation at about 2,010km (1,250miles) in length.Europe's Matterhorn,on the Italian-Swiss border,is one of the most beautiful mountains on Earth and in southern Africa, the spectacular Victoria falls is on the Zambezi between Zimebabwe and Zambia.