RIVERS AND BEACHES
RIVERS AND BEACHES ESS 230
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This 3 page Study Guide was uploaded by Miss Jeanette Keebler on Wednesday September 9, 2015. The Study Guide belongs to ESS 230 at University of Washington taught by Staff in Fall. Since its upload, it has received 174 views. For similar materials see /class/192678/ess-230-university-of-washington in Earth And Space Sciences at University of Washington.
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Date Created: 09/09/15
Questions to be answered by a few words or numbers 12 points each brie y de ne the following term Sediment Regime The amount and size of material delivered from both hillslopes and upstream What are the primary distinguishing characteristics of mountain rivers Steep Coarser Low Width to Depth ratio Rougher Who drew the rst contour map Leonardo da Vinci The Earth is composed of two predominant surfaces One is a land surface with a mean elevation just above sea level Ultimately much river sediment reaches the other surface which is the deepsea oor What is the approximate depth of the deepsea oor 3 0006000 In The Earth s land surface produces sediment for beaches and to ll the rest of the ocean Approximately what fraction of the Earth s surface is land 30 What is the predominant source of lithogenic sediment found at high latitudes Glaciers uestions to be answered bv a few sentences 5 points each Describe the primary constituents of a river s load water sediment dissolved material and organic matter OR suspended load bedload dissolved load amp organic matter Rivers transport particulate and dissolved materials to oceans The dissolved material can be transformed into solid sediment particles Describe the two general types of processes by which dissolved material is transformed into marine sediment T he formation of biogenic sediments is a process by which plants and animals in the ocean take dissolved materials and create their skeletons When they die their skeletons break into pieces and become sediment particles T he formation of authigenic sediments is a process by which inorganic precipitation occurs from dissolved materials in seawater Oversaturation of seawater with regard to some chemical components causes formation of sediments such as manganese nodules Explain why sea level was lowered during cold periods of the Earth s climate During cold periods much of the precipitation falling on land is snow and remains to form thick sheets of glacial ice miles thick Water continues to evaporate from the ocean but does not flow back due to its retention in ice sheets This causes sea level to fall In addition cold temperatures cause ocean water to contract Water supplied by rivers has an important difference in density compared to Puget Sound water Which is denser and explain its cause The freshwater owing in from rivers has a salinity of 0 parts per thousand ppt which is less dense than the brackish water of Puget Sound with a salinity of 2030 ppt Consequently the river water ows above the denser water in Puget Sound
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