Www.geosociety.org/educate/LessonPlans/SeaFloorSpreading.pdf. Seafloor Spreading Animation - Earthguide Online Classroom. SeafloorSpreading.swf. Pdf/MappingHigher.pdf. Pdf/Activity_11-1.pdf. Technology: Submersibles: Alvin. Alvin, which is operated by Woods Hole Oceanographic Institution (WHOI), has been in operation since 1964. It was affectionately named after WHOI engineer Allyn Vine, whose influence was pivotal in Alvin’s conception. A legendary figure at WHOI, Vine first envisioned a deep-sea research vessel in the 1930s when he was a graduate student in physics. Alvin was the first deep-sea submersible capable of carrying passengers, usually a pilot and two observers. Its first untethered dive measured 35 ft. Now, after numerous upgrades and reconstructions, Alvin can plunge to a maximum depth of 14,764 ft. Just as the space shuttle is built to withstand the near total vacuum of outer space, Alvin is built to withstand the crushing pressure of the deep ocean.
The titanium-hulled sub can remain submerged for 10 hours under normal conditions, although its life support system will allow the sub and its occupants to remain underwater for 72 hours. Alvin's Influential History Deployment and Features. National Aquarium | A Blue View | Mapping the Seafloor. The world’s longest mountain range remains unseen by most due to its location in the vast depths of the ocean. At 3,700 miles long, the Global Mid-Ocean Ridge circles the globe almost entirely underwater, extending from the Arctic Ocean to the Atlantic Ocean, around Africa, Asia and Australia, and under the Pacific Ocean to the west coast of North America. This massive mountain range is also the largest single volcanic feature on Earth, with an estimated 20 volcanic eruptions occurring every year.
If you’ve never heard about these underwater eruptions, it’s not because you’re watching the wrong news station. They typically go unnoticed by humans since most of the ridge is more than 6,562 beneath the water’s surface. The volcanic activity is the result of the constant movement of the Earth’s crust along the Global Mid-Ocean Ridge. Depending on what part of the ridge you’re exploring, its shape could appear smooth or rugged—its morphology varies by location. Back to the Top. U.S. Navy Museum | Cold War Gallery | Education | Lesson Plan. Ocean Floor Mapping Worksheet Objective: Provide students a basic understanding of how sonar (SOund NAvigation and Ranging) is used to map the ocean floor. Students use a simple calculation to determine the depth of the ocean floor at 15 points from Miami Beach eastward to the wreck of the SS Sapona in the Bahama Islands.
This is a total distance of 53 miles. Materials: Data Map with sonar duration times listed (below), Graph Paper (example below) Instructions - Ocean Floor Mapping Worksheet: In 1926, the SS Sapona, a ship used to transport alcohol during prohibition, ran aground during a hurricane. How is it that fifty-four miles out from the beach this ship is sitting in such shallow water? The map below shows the Atlantic Ocean from Miami Beach eastward to the Bahamas. Click here for a sample graph paper layout. Data Map: The 17 positions on the map shown here give the length of time that a sonar pulse took to travel to the ocean floor and back to the sonar array onboard your boat. 1. Plate Tectonics : Earthview. Earthguide: Online Classroom - Age of the seafloor.
Earthguide: Online Classroom - Midocean ridges. Map of te ocean floorFrom "World Ocean Floor Panorama", Authors Marie Tharp and Bruce C. Heezen, 1977. Copyright by Marie Tharp 1977/2003. Reproduced by permission of Marie Tharp Maps, LLC , 8 Edward Street, Sparkill, New York 10976.Marie Tharp Maps at Questions for thought Find the midocean ridges on this map. What is the name of the undersea mountain range that is the midocean ridge in the Atlantic? What is the name of the undersea mountain range that is the midocean ridge in the Pacific?
Earthguide Online Classroom - Plate margins. Seafloor Spreading Animation - Earthguide Online Classroom. Earthguide.ucsd.edu/eoc/teachers/t_tectonics/seafloor_spreading.swf. Rhs.rocklinusd.org/subsites/Earth-Science/documents/CHAPTER 10 PLATE TECTONICS.pdf. Earthguide: Online Classroom - Depth of the seafloor. Image from computerized digital images and associated databases available from the National Geophysical Data Center (NGDC), National Oceanic and Atmospheric Administration,U.S. Department of Commerce. Ideas Discuss the nature of color-contour maps. Discuss meaning of specific colors according to the scale Identify significant topographic features of the Earth's surface Introduce vocabulary Practice identifying geographic features Discuss how this map was produced. Questions for thought How deep is the seafloor around Hawaii?