GEOS 212 Week 3 Notes
GEOS 212 Week 3 Notes GEOS 212
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This 2 page Class Notes was uploaded by madelinef on Thursday September 8, 2016. The Class Notes belongs to GEOS 212 at University of Arizona taught by Joellen Russell in Fall 2016. Since its upload, it has received 80 views. For similar materials see Introduction to Oceanography in Tier 2 Gen Ed at University of Arizona.
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Date Created: 09/08/16
GEOS 212 Notes Week 3 Mountains and Weathering How do we know what is down in the ocean? o Submarines, drill ships, pinging o Sediment thick in the Gulf of Mexico from the Mississippi river o Q: Why thick sediment on the east coast and think on the west? East is rainier, amazon river flows east, subduction zone in the west. Sediment Cycles o Magma Granite= Make Crust o Rocks Sediment transported and deposited Drawing of Sediment Cycle Ways to make mountains o Pulling continent apart- continental rifting- Africa and Western United States o Chain of Subduction zone volcanoes Andes and Cascades o Colliding Continents Himalayas, alps, and Appalachian mountains o Transform faults like san Andreas fault san Gabriel’s in L.A.) o Hot spots Hawaii and Yellowstone Ways to Destroy mountains o Physical and chemical weathering o Physical Ex: monument valley Water (main agent) Sunlight Salt Wind- big in the desert because combines with dust particles Freeze-Thaw- liquid thaws and drips into cracks during the day, freezes and expands crack and night. Repeats the next day. Salt Crystals in Desert- salt dissolves into water vapor or water and evaporates leaving salt to dissolve rock. Q and A: sediment that is transported in California, Chile, Africa, Russia is done by wind. You can tell because on a map these areas are tan! Depositing sediment on a sea floor o Comes out of a delta o Beach sand made up of a lot of things! Mostly sea shells, rock, mud, clay… o Marine Life calcite limestone make fine sand Sediment in deep water o Rivers or ice- breaking down mountains o Blown in by wind- can get it in the middle o Glaciers- near coast o Turbidite- submarine “landslide” or mud, skeletons. Can create a tsunami because it displaces water. Slumps off edge of sea shelf o Sand and dust blown from deserts covers much of the deep sea floor o Skeletons of marine organisms What kind of skeletons? o Diatoms- most abundant organism on earth. Made of silica o Plankton- microscopic and floating o Diatoms- plants, skeletons made of quartz o Cocoliths= second most abundant organism. Planktonic plants, skeletons made of calcite o Q: Why is sediment thin in middle of Atlantic Ocean? A: Farther from land, wind carries a little, new ocean floor there Sediment Type Map o Closest to land- shelf sediments and turbidities o Next to that is skeletons of diatoms (plankton). Not everywhere only near India tip and on west side of the Americas o Next to skeletons or shelf sediments is mud (carried from deserts by wind) o Farthest out in the middle is skeletons of cocoliths (plankton) o Sediment is thickest near big rivers, continents, big in high productivity zones and thin far from land (especially where spreading happens) Reminders for next week: o Project proposal is due on Tuesday to mailboxes/d2l (see d2l for guidelines) o Hw 2 is now open to be completed
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