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Hace 1 día · Mantle convection is the dominant mechanism by which planets cool and undergo chemical segregation. The flow of the mantle induces motion in the overlying crust, which can lead to such phenomena as volcanoes, earthquakes, and (uniquely for Earth) plate tectonics.
Hace 4 días · Tectonic plates are composed of the oceanic lithosphere and the thicker continental lithosphere, each topped by its own kind of crust. Along convergent plate boundaries, the process of subduction carries the edge of one plate down under the other plate and into the mantle.
Hace 4 días · Evidence for plate movement includes continental drift, appearance of younger crustal layers in the ocean, earthquakes along plate boundaries, the presence of similar fossils and rocks on separate continents, and the matching shapes of continents.
Hace 5 días · Antarctica and continental drift. The geologic evolution of Antarctica has followed a course similar to that of the other southern continents. The earliest chapters in Antarctica’s rather fragmentary record extend far back, perhaps as much as 3 billion years, into early Precambrian time.
Hace 8 horas · Continental Drift All racing games have a few elements in common: a selection of cars, tracks, and a handful — at least — of gameplay modes.
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Hace 2 días · RAFOS/SOFAR floats are autonomous platforms that drift at a fixed depth between 500 m and 1 km. We select the floats based on the same criteria as for the surface drifters, except that we extend the seeding line and the box offshore by two degrees (Figure 6) to account for the fact that floats drift deeper over the continental slope.
