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Seafloor Spreading

Seafloor Spreading. Chapter 17 Plate Tectonics, Section 2. Help From technology. In the mid-1900’s most people thought ocean floor was flat Sonar uses sound waves to measure water depth Magnetometers detect small changes in magnetic fields Maps from this data showed ocean was not flat.

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Seafloor Spreading

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  1. Seafloor Spreading Chapter 17 Plate Tectonics, Section 2

  2. Help From technology • In the mid-1900’s most people thought ocean floor was flat • Sonar uses sound waves to measure water depth • Magnetometers detect small changes in magnetic fields • Maps from this data showed ocean was not flat

  3. Ocean rocks and magnetism Ocean ridge rock samples are younger than deep-sea trenches. The magnetic pattern on one side of the ridge is a mirror image of the patter on the other side Isochron maps show us that young ocean floor crust is near the ocean ridges

  4. Seafloor Spreading • Ocean crust is formed at ridges and destroyed at trenches • Each cycle of spreading and magma intrusion results in new ocean crust forming.

  5. http://earthguide.ucsd.edu/eoc/teachers/t_tectonics/p_seafloorspreading.htmlhttp://earthguide.ucsd.edu/eoc/teachers/t_tectonics/p_seafloorspreading.html

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