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Match the following features with their role in seafloor spreading:
Match the following features with their role in seafloor spreading:
Mid-ocean ridges = Location of seafloor spreading Magma = Material that forms new oceanic crust Tectonic plates = Segments of the Earth's lithosphere Transform faults = Lateral movement between tectonic plates
Match the following terms with their significance in seafloor spreading:
Match the following terms with their significance in seafloor spreading:
Subduction zones = Where old oceanic crust is recycled into the mantle Paleomagnetism = Evidence for seafloor spreading Magnetic striping = Pattern of alternating polarity on the ocean floor Hess's hypothesis = Theory proposing seafloor spreading
Match the following scientists with their contributions to seafloor spreading:
Match the following scientists with their contributions to seafloor spreading:
Harry Hess = Proposed the theory of seafloor spreading Fred Vine = Discovered magnetic striping on the ocean floor Marie Tharp = Created the first map of the ocean floor Allan Cox = Provided evidence for seafloor spreading through paleomagnetism
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Study Notes
Features of Seafloor Spreading
- Mid-ocean ridges: sites of volcanic activity where new oceanic crust is created as magma rises to the surface and solidifies
- Transform faults: zones where two tectonic plates are sliding horizontally past each other, without creating or destroying crust
- Magnetic stripes: alternating patterns of magnetized rocks on either side of mid-ocean ridges, providing evidence for seafloor spreading
- Oceanic trenches: deep, narrow depressions in the Earth's crust where older, denser crust is being pushed back into the mantle
Significance of Terms in Seafloor Spreading
- Seafloor spreading: the process of new oceanic crust being created at mid-ocean ridges and destroyed at oceanic trenches
- Paleomagnetism: the study of the Earth's magnetic field as recorded in rocks, providing evidence for seafloor spreading
- Convection currents: slow, circulating movements of hot, viscous rock in the Earth's mantle, driving plate tectonics
Contributions of Scientists to Seafloor Spreading
- Harry Hess: proposed the theory of seafloor spreading and the concept of convection currents
- Marie Tharp: created detailed maps of the ocean floor, revealing the existence of mid-ocean ridges and transform faults
- Fred Vine: developed the theory of paleomagnetism, providing key evidence for seafloor spreading
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