Submit Feedback. Subduction and sea floor spreading are both a result of the movement of the tectonic plates. Hot magma fueled by mantle convection bubbles up to fill these fracture s and spills onto the crust.
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The investigation of the mid-ocean-ridge, using the magnetic stripes resulted in the three discoveries. Sea-Floor Spreading Molten material erupts through the valley that runs along the center of some mid-ocean ridges. Existing questions. Convection current s carry heat from the lower mantle and core to the lithosphere.
The East Pacific Rise is a mid-ocean ridge that runs through the eastern Pacific Ocean and separates the Pacific plate from the North American plate, the Cocos plate, the Nazca plate, and the Antarctic plate. As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense.
Study Cards for the Semester Exam. Subduction is another.
Media Some media assets videos, photos, audio recordings and PDFs can be downloaded and used outside the National Geographic website according to the Terms of Service. Supporters of continental drift originally theorize d that the continents moved drifted through unmoving oceans.
The less-dense material rises, often forming a mountain or elevated area of the seafloor.
The oceanic crust is composed of rocks that move away from the ridge as new crust is being formed. Name and describe the feature of the ocean floor shown at A. As the rock moves, further, it becomes colder and denser until it reaches an ocean trench or continues spreading. Fill in the blank with a highlighted vocabulary word p.