Oceanic crust, the outermost layer of Earth’s lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges, which occur at divergent plate boundaries. This theory explains the movement of the Earth's plates (which has since been documented scientifically) and also explains the cause of earthquakes, volcanoes, oceanic trenches, mountain range formation, and many other geologic phenomenon.
After submitting the save form, be sure to copy the new URL in your browser so that you can revisit it later. In turn, we find some of the youngest geologic rocks at these mid-oceanic ridges. To save your map, click the save button.
Ah, so that’s where it gets its name from. The earth’s crust is divided up into sections called tectonic plates.
Active volcanoes (red dots) define the Pacific Ring of Fire where they form along tectonic plate boundaries.
The Indo-Australia plate stretches from Australia to India. Bathymetry, the shape of the ocean floor, is largely a result of a process called plate tectonics.The outer rocky layer of the Earth includes about a dozen large sections called tectonic plates that are arranged like a spherical jig … But they are widely considered to be two separate plates. The east-side of the North American Plate straddles the Eurasian Plate and African Plate.This is the Mid-Atlantic Ridge where divergent tectonic plates pull apart from each other. Convergent plate boundaries are locations where lithospheric plates are moving towards one another. Some of the most familiar ocean trenches are the result of this type of convergent plate boundary.The Peru-Chile Trench off the west coast of South America is formed by the oceanic crust of the Nazca plate subducting beneath the continental crust of the South American plate. Tectonic plates are pieces of the rocky outer layer of the Earth known as the crust. A subduction zone consists of material scraped off the ocean floor near the coast (accretionary wedge) and a chain of volcanoes farther inland (volcanic arc). Superimposed in red are the more than 400 National Park System sites. As you can see, some of the plates contain continents and others are mostly under the ocean. Video: Major Plates of the Lithosphere: Earth's Tectonic Plates. These plates are constantly moving, and volcanoes and earthquakes are found at plate boundaries. As an oceanographic cartographer, Marie Tharp is credited with scientifically mapping the ocean floor in partnership with her colleague Bruce Heezen.
The Indo-Australia plate is a major plate combining the Australian and Indian Plate. Oceanic crust is about 6 km (4 miles) thick.
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