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Geologic Origin of Lakes, Wetlands, & Estuaries (pp.277-287)

Geologic Origin of Lakes, Wetlands, & Estuaries (pp.277-287). Think-Pair-Share. Take a moment and think about how lakes, wetlands, and estuaries were formed. Share this with your partner(S). Now, let’s discuss your ideas with the class. Overview. Glacial Lakes Volcanic Lakes Tectonic Lakes

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Geologic Origin of Lakes, Wetlands, & Estuaries (pp.277-287)

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  1. Geologic Origin of Lakes, Wetlands, & Estuaries(pp.277-287)

  2. Think-Pair-Share • Take a moment and think about how lakes, wetlands, and estuaries were formed. • Share this with your partner(S). • Now, let’s discuss your ideas with the class.

  3. Overview • Glacial Lakes • Volcanic Lakes • Tectonic Lakes • Lakes w/ Other Origins • Origins of Wetlands • Origins of Estuaries

  4. Question • How did the lakes of North America form? • You may need to do a little research on this one. • You have 15 minutes to use the internet to gather information. • Afterwards we will discuss your findings with the class.

  5. Lakes of Glacial Origin– most important lake-creating force over last few millennia.- Most of the world’s lake basins, including Great lakes, were formed during the Pleistocene era (glaciers covered earth)-The Ice Age-Introduction - Footprints of the Ice Age: part 1 of 14

  6. Terminology • Glacial Till (drift) –Remnants of the erosive action of glaciers moving across bedrock. Sediments, such as clays, sand, gravel, boulders. • Moraines – piles of glacial till that often dam up valleys and streams. Glaciers sometimes expand and push up eroded material called a terminal moraine.

  7. Cirque Lake – “semicircle” -head of glaciated valleys-dammed at the outlet by a low barrier of glacial debris =moraine

  8. Cirque Lake

  9. Recognizing Cirque Lake from Topo Map

  10. Lonesome Lake, NH

  11. Paternoster Lakes – arrangement of lakes in a linear series • created by terminal moraines, or rock dams, that are formed by the advance and subsequent upstream retreat and melting of the ice

  12. Paternoster Lakes – ex: Glacier National Park, Montana

  13. Kettles on Glacial Outwash Plain

  14. Kettle Lakes/Ponds (plate 9)

  15. Kettle Lakes on Pitted Outwash Plain

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