https://peertube.dngr.us/videos/watch/8283241d-4876-4a27-8dae-0267d363fed3 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 "Ground Water" is an instructional film from 1935 that traces the movement of water through the watershed. It was made by ERPI classroom films (later to be known as Encyclopedia Britannica Films) which was founded in the 1920’s. (ERPI; along with other film companies such as Eastman Teaching Films, Pathe Exchange and Coronet Instructional films produced works for educational use. Encyclopedia Britannica would go on to become one of the leading film producers for schools and libraries from the 1940’s to the 1990’s.) The film opens with rain bubbling and collecting on the surface of the ground (:31). This water will penetrate the soil eventually forming ground water (:32). Ground water trickles back up and out of a tiny spring (:41). An underground channel (:47) leads to a geyser (:49). A diagram follows to show the path of the groundwater (:58) as it feeds a well. The upper surface of the saturated ground is known as the water table (1:33). The water table rises (1:41). Layers of shale rest atop the groundwater (2:26). This collection of water is known as a reservoir (2:31) which can be tapped as water flows from a well (2:40). Ground water naturally seeps from porous rocks (2:54). A hot spring erupts (3:04). Minerals left behind from hot water springs build terraces (3:18). A sample of small plant life growing within the terraces is plucked (3:29). Deposits are quarried (3:42). The rock pictured is travertine rock to be used for ornamental wall finishes. A bubbling geyser follows (4:02). A diagram displays activity under the geyser (4:13). Daisy Geyser in Yellowstone National Park (5:15) is pictured. Old Faithful blows hourly (5:34) during winter and summer months. The Norris basin sits nearby (5:51). The film turns to an underground chamber in Carlsbad, New Mexico (7:09). A sketch shows the process of the formation of stalagmites (6:59). Actual formations follow from Carlsbad (7:09). Wispy deposits known as moss are pictured (7:33). A stream flows through Mammoth Cave in Kentucky (7:47). An animation shows what happens when a cave’s roof collapses (8:13). The durable roof left behind forms a natural bridge (8:30). The Petrified Forest National Park in northeastern Arizona (8:43) is visited. Here, skeletons of ancient animals are preserved (9:12). A dinosaur skull appears (9:21). The interior of a geode follows (9:32). Rich Iron ores exist in the Lake Superior regions (9:39). This was an ERPI Classroom Film (10:17). 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=u14TT0Nme6s Mirrored from Periscope Film (https://www.youtube.com/@PeriscopeFilm) Sat, 13 Jun 2026 15:15:39 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/8283241d-4876-4a27-8dae-0267d363fed3 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.