It's #TravelTuesday and #ASUEverywhere is taking you to the Grand Canyon, often considered one of the Wonders of the World and the 17th U.S. National Park, established in 1919. This is just one of the virtual field trips available through ASU for You at vft.asu.edu.⁣ 🌊 The Colorado River carved out the Grand Canyon about 230 miles north of Phoenix. What makes the mile-deep, 277-mile long canyon so unique is that it exposes nearly 2 billion years of the Earth's geological history. 💪 This stream in the North Rim's Nankoweap Canyon transports sand and gravel, giving large and small rocks their rounded shape as they tumble … some rocks are so big that they can only be carried by the stream when flooded. ⤴️ These limestone beds in Nankoweap Canyon start out nearly horizontal, then begin to tilt upwards, suggesting the presence of a fault line. 🏖 The lowest, bottom layer of the Grand Canyon is called the Tapeats Sandstone, made from beach sand that has turned into rock under the pres...