File:Upper Falls of the Yellowstone River (Yellowstone, Wyoming, USA) 8 (47602182922).jpg
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[edit]DescriptionUpper Falls of the Yellowstone River (Yellowstone, Wyoming, USA) 8 (47602182922).jpg |
From park signage: Upper Falls of the Yellowstone River A waterfall forms in a river channel where harder rocks meet softer rocks that erode more easily and quickly. Here, volcanic and hydrothermal activity have created the 109-foot Upper Falls. Why here? 1) About 480,000 years ago, lava formed a layer of rock that resists erosion. The lava naturally cracks in a zig-zag pattern. 2) Over time, hydrothermal springs rose through some of these cracks, altering and weakening the lava. 3) The Yellowstone River flowed through the zig-zag cracks and eroded its river channel. Once the river reached the softer, hydrothermally-altered rock, erosion increased and created the Upper Falls. |
Date | |
Source | Upper Falls of the Yellowstone River (Yellowstone, Wyoming, USA) 8 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/47602182922. It was reviewed on 28 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
28 January 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:31, 28 January 2020 | ![]() | 4,288 × 2,848 (6.71 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Date and time of digitizing | 10:37, 5 April 2014 |
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Date metadata was last modified | 16:27, 20 April 2019 |
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