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19 Ιουλ 2013 · Plate Tectonics - Sea-Floor Spreading. To access a comprehensive array of complete multimedia lessons visit http://www.newpathlearning.com-Plate Tectonics...
In this video an introduction to seafloor spreading, subduction and megathrust earthquakes are animated to allow for easier understanding of the topics.
26 Απρ 2024 · The theory of plate tectonics states that Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
29 Νοε 2023 · Seafloor spreading is a geologic process in which tectonic plates —large slabs of Earth's lithosphere —split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow, churning motion of Earth’s mantle.
Seafloor spreading, theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them. This idea played a pivotal role in the development of the theory of plate tectonics, which revolutionized geologic thought during the last quarter of the 20th century..
Key points. Seafloor spreading takes place at midocean ridges and produces basalt, the rock that makes up the oceanic crust. The Mid-Atlantic Ridge and East Pacific Rise are examples of midocean ridges. Midocean ridges reach a typical summit elevation of 2,700 meters below sealevel.
1 Οκτ 2024 · As upwelling of magma continues, the plates continue to diverge, a process known as seafloor spreading. Samples collected from the ocean floor show that the age of oceanic crust increases with distance from the spreading centre —important evidence in favour of this process.
