Grand Canyon is one of Earth’s most recognizable landscapes. Though scientists have studied the canyon for more than 150 years, a definitive answer as to how and when the canyon formed eludes them. Th
Imagine seeing the varied landscapes of the earth as they used to look throughout hundreds of millions of years of earth history. Tropical seas lap on the shores of an Arizona beach. Immense sand dune
Allow yourself to be taken back into deep geologic time when strange creatures roamed the Earth and Western North America looked completely unlike the modern landscape. Volcanic islands stretched fro
