GEO307 Ch 4 Notes - GEO307 Chapter 4 I. Measuring depths a....

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GEO307 Chapter 4 I. Measuring depths a. Hand line (wire marked w/ fathoms, w/ lead weight on end [fathom = 6 ft]) b. Echo sounder – depth recorder c. LADS (Laser Airborne Depth Sounder) – uses light instead of sound in shallow water d. Satellites – use gravity’s effect on sea surface e. Multi-beam sound systems (i.e. side-scan sonar system/swath bathymetry) – allows for 3D contouring II. Unique Ocean Features a. Greatest canyons (Challenger Deep) b. Greatest vertical rise (Hawaii) c. Greatest mountain ranges (mid-ocean ridge) III. Continental margin – area of continental land mass present below sea level a. b. c. Continental shelf i. Geologically part of continent ii. Exposed in past glaciations iii. Variable width (averaging 65 m) iv. Depth at edge about 130 m
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v. Sediment accumulation from various sources d. Submarine canyons – formed during lower sea levels, extensions of modern rivers
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This note was uploaded on 04/16/2008 for the course GEO 307 taught by Professor Gardner during the Spring '08 term at University of Texas at Austin.

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GEO307 Ch 4 Notes - GEO307 Chapter 4 I. Measuring depths a....

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