File:Glacial grooves from Pleistocene glaciation on Columbus Limestone (Middle Devonian) (Kelleys Island, far-northern Ohio, western Lake Erie, USA) (14972402378).jpg
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Glacial grooves on Columbus Limestone (lower Middle Devonian) from Kelleys Island, western Lake Erie, USA (public display, Field Museum of Natural History, Chicago, Illinois, USA). Glaciers are rivers of ice. Ice is a mineral (H2O). Glacial ice is a rock (technically, a metamorphic rock). Despite being solid, ice does flow under certain conditions at the Earth’s surface. Occasionally, Earth experiences Ice Ages, during which extensive ice sheets cover and move over significant portions of the Earth’s surface. As ice moves over landmasses, it erodes underlying rocks and picks up small to large pieces of debris. This debris accumulates at the base of the ice sheet and scrapes bedrock as the glacier moves, resulting in glacial scratches (glacial striations) (= thin scratch lines on rock) and glacial grooves (= large channels incised in rock). |
| Date | |
| Source | Glacial grooves from Pleistocene glaciation on Columbus Limestone (Middle Devonian) (Kelleys Island, far-northern Ohio, western Lake Erie, USA) |
| 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@N05/14972402378 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 02:27, 8 October 2019 | | 2,257 × 1,717 (2 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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