UMass Amherst GEO-SCI 103 - Earth in 2, 3, and 4 Dimensions: Maps, Structure and History (6 pages)

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Earth in 2, 3, and 4 Dimensions: Maps, Structure and History



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Earth in 2, 3, and 4 Dimensions: Maps, Structure and History

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Describes the various steps and methods of measuring, calculating and establishing conclusions of life and structures below the ocean surface. To fully grasp the development of the oceans and waters, the lecture further describes the significance in examining the history of Earth and its creation process.


Lecture number:
3
Pages:
6
Type:
Lecture Note
School:
University of Massachusetts Amherst
Course:
Geo-Sci 103 - Intro Oceanography GenEd: PS
Edition:
1

Unformatted text preview:

GEO SCI 103 Lecture 3 Outline of Last Lecture I Brief History of Ocean Exploration II Latitude and Longitude III Latitude Climate Zones and the Circumference of the Earth IV Navigation Finding Your Way at Sea Outline of Current Lecture Earth in 2 3 4 Dimensions maps structure and history I Exploring the Seafloor A Echo Sounding B Bathymetric Maps II Advances in Seafloor Research A Technological Advances III The Exclusive Economic Zone EEZ and the Law of the Sea A Freedom of the Seas who is entitled to what B Emergence of Regulations IV History of the Earth A Creation of the Earth B Chemical Weathering C Excess Volatiles D Chronology of the Evolution and Formation of Earth V Correlation of Rock Units A Determining Age without using Radiometric Measures Current Lecture I Exploring the Seafloor A Echo Sounding a Prior to the 20th century the only means of determining the depth of the ocean was through the method known as sounding b Echo Sounding A sound transmitter mounted on the hull of a ship emits high frequency sound waves that travel through the water and are reflected off the seafloor 1 These returned echoes are detected by a device called a hydrophone These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute B Bathymetry Maps a Numerous closely spaced echo sounder profiles can be used to construct a bathymetric map of the seafloor which refers to the depth of the seafloor below the ocean surface b Topography Map the height of the land surface above sea level c First maps of bathymetry ever made was from wire line soundings by the Coast Survey Steamer Blake in the Gulf of Mexico during 1874 1875 d Modern bathymetric maps show the same information even though soundings can be done much more quickly e Contour lines isobaths connect points that are at equal depths below sea level and provide a way of visualizing three dimensions on a flat piece of paper f Seismic



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