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In this video an introduction to seafloor spreading, subduction and megathrust earthquakes are animated to allow for easier understanding of the topics.
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In this video, we take a look at the concept of seafloor spreading and the four major pieces of evidence that support it, with a focus on the observed altern...
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.
Seafloor spreading determines plate motion around a midocean ridge. Midocean ridges are always plate boundaries. Since many plates, such as the North American Plate, include continental portions attached to oceanic portions, seafloor spreading also the direction in which continents move.
This animation of seafloor spreading and plate tectonic evolution of the planet since 200 million years ago is created from a synthesis of marine geophysical data (namely, the magnetic anomalies) and geological data on the continents.
Breakup of Pangea. 250 million years ago, there was a single gigantic continent called Pangea. View an animation of what became of this supercontinent. (Animation by Natalie Renier, WHOI Graphic Services) The Age of the Seafloor. Seafloor spreading occurs at divergent boundaries where plates split apart from each other, as mid-ocean ridges do.
