アメリカ内務省さんのインスタグラム写真 - (アメリカ内務省Instagram)「Canyonlands #NationalPark in #Utah is a showcase of geology. In each of the park's districts, visitors can see the remarkable effects of time and erosion on a landscape of sedimentary rock. For millions of years, rock was broken down and carried here by wind and water, creating deposits that eventually became distinct rock layers. Many of the rocks layers were deposited near sea level, but after a long period of uplift, the average elevation is now over 5,000 feet above sea level. As this area gradually rose, rivers that once deposited sediment on the lowlands began to remove it from the emerging plateau. The Green and Colorado rivers carved into the geologic layer cake, exposing buried sediments and creating the canyons and rock spires of #Canyonlands that amaze us now. Photo @CanyonlandsNPS by Randy Smythe (www.sharetheexperience.org). #science #usinterior」7月30日 9時10分