File:Upper Falls of the Yellowstone River (Yellowstone, Wyoming, USA) 15 (33777532128).jpg
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| Description |
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) 15 |
| Author | James St. John |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/33777532128. 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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:31, 28 January 2020 | | 3,000 × 4,000 (6.72 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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