https://peertube.dngr.us/videos/watch/2940241e-b290-4f38-b2bb-417e1d4f112e Join this channel to get access to perks: https://www.youtube.com/channel/UCddem5RlB3bQe99wyY49g0g/join Help us preserve, scan and post more rare and endangered films! Join us on Patreon. Visit https://www.patreon.com/PeriscopeFilm Visit our website www.PeriscopeFilm.com This 1935 Erpi Classroom Film looks at how rivers are formed and shape the environment around them. It starts with how small streams turn into large rivers through the water cycle. This is followed by how gullies, canyons, flood plains, and drainage areas are created. The film ends with the erosion that rivers cause through waterfalls and sediment deposits. 0:08 “The Work of Rivers” Instructional Sound Film produced by Erpi Classroom Films Inc., 0:10 different shots of waterfalls, 0:47 a river flowing, 1:14 rain falling, 1:21 a small stream slowly turning into a large river, 2:01 a gully formed after heavy rain, 2:41 a dry gulley, 3:00 a large canyon, 3:29 a river bank eroding over time, 4:02 overview of a large drainage area, 4:16 map showing tributary flood plain erosion, 4:36 a map showing the St. Lawrence river system, 4:52 the Niagara Falls, 5:08 animation showing how a waterfall erodes, 5:32 animation showing the Niagara falls growing since 1764, 6:04 demonstration of a river creating Oxbows, 6:49 a serpentine river, 7:24 process of water gap creation shown, 8:16 a sandbar in a river, 8:30 demonstration of a sediment deposited in a delta, 8:59 a flooded river that has overwhelmed flood protection, 9:30 a scenic waterfall, 9:55 Erpi (Electrical Research Products Inc.) Classroom Films Inc. was renamed post-1943 as Encyclopædia Britannica Films (also named EB Films for short). It was the top producer and distributor of educational 16mm films and later VHS videocassettes for schools and libraries from the 1940s through the 1990s. Motion picture films don't last forever; many have already been lost or destroyed. We collect, scan and preserve 35mm, 16mm and 8mm movies -- including home movies, industrial films, and other non-fiction. If you have films you'd like to have scanned or donate to Periscope Film, we'd love to hear from you. Contact us via the link below. This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit http://www.PeriscopeFilm.com Source: https://www.youtube.com/watch?v=ZapLmMOOsEI Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 12:49:23 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us https://peertube.dngr.us/lazy-static/avatars/41a6fee9-7f57-42d0-a5fc-5db4f1af2e31.png https://peertube.dngr.us/videos/watch/2940241e-b290-4f38-b2bb-417e1d4f112e All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.