World`s greatest plates. Chloe, Kristian , Tammy, Ashley. Tectonic plates.
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The theory that proposes that earths outer shell consists of individual plates that interact in various ways and thereby produce earthquakes volcanoes mountains and the crust itself. The theory that the lithosphere is made of plates that move and interact with each other at their boundaries. A theory that describes how the continents move theory which explains the distribution of continents, earthquakes, volcanoes, and mountains.
The African Plate is a tectonic plate which includes the continent of Africa, as well as oceanic crust which lies between the continent and various surrounding ocean ridges.
The African Plate includes several cartons, stable blocks of old crust with deep roots in the sub continental lithospheric mantle, and less stable terrenes, which came together to form the African continent during the assembly of the supercontinent Pangaea around 550 million years ago
The movement of tectonic plates via convection currents of heat from Earth\'s interior.The lithosphere is broken up into tectonic plates. On Earth, there are seven or eight major plates (depending on how they are defined) and many minor plates. Where plates meet, their relative motion determines the type of boundary: convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries. The lateral relative movement of the plates typically varies from zero to 100 mm annually.
The lithosphere is broken up into tectonic plates. On Earth, there are seven or eight major plates (depending on how they are defined) and many minor plates. Where plates meet, their relative motion determines the type of boundary: convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries. The lateral relative movement of the plates typically varies from zero to 100 mm annually.
The North American Plate is a tectonic plate covering all of North America, Greenland, Cuba, Bahamas, and parts of Siberia, Japan and Iceland. It extends eastward to the Mid-Atlantic Ridge and westward to the Chersky Range in eastern Siberia. The plate includes both continental and oceanic crust. The interior of the main continental landmass includes an extensive granitic core called a craton. Along most of the edges of this craton are fragments of crustal material called terranes, accreted to the craton by tectonic actions over the long span of geologic time. It is believed that much of North America west of the Rockies is composed of such terranes. The South American Plate is a continental tectonic plate which includes the continent of South America and also a sizeable region of the Atlantic Ocean seabed extending eastward to the Mid-Atlantic Ridge.
The easterly side is a divergent boundary with the African Plate forming the southern part of the Mid-Atlantic Ridge. The southerly side is a complex boundary with the Antarctic Plate and the Scotia Plate. The westerly side is a convergent boundary with the sub ducting Nazca Plate. The northerly side is a boundary with the Caribbean Plate and the oceanic crust of the North American Plate. At the Chile Triple Junction in Taitato-Tres Montes Peninsula, an oceanic ridge — the Chile Rise — is sub ducting under the South American plate.
The Pacific Ocean basin. cirque A steep-walled, bowl-shaped depression formed by ...continental–continental plate boundary A convergent plate boundary along ... of the continental slope.
Geologically, oceanic basins may be actively changing size or may be inactive, depending on whether there is a moving plate tectonic boundary associated with it. The elements of an active - and growing - oceanic basin include an elevated mid-ocean ridge, flanking abyssal hills leading down to abyssal plains. The elements of an active oceanic basin often include the oceanic trench associated with a subduction zone.
The Himalayas were formed around 70 million years ago, when the Indo-Australian Plate collided with the Eurasian Plate at a convergent/destructive plate boundary. This has caused fold mountains to form as there are no subductions of the plates that can be seen from the absence of volcanoes in the Himalayas.
While new ocean crust is constantly being created at mid-ocean ridges, old crust must either be destroyed or reduced at the same rate (or else the planet would be continually expanding and increasing in volume). The plates, therefore, emerging along mid-ocean ridges, sliding over the athenosphere, and grinding past other plates along transform faults, are almost all headed on a collision course. When two continents carried on converging plates ram into each other, they crumple and fold under the enormous pressure, creating great mountain ranges.
Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics.
In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement along the fractures as a result of earth movement. Large faults within the Earth\'s crust result from the action of plate tectonic forces. Energy release associated with rapid movement on active faults is the cause of most earthquakes, such as occurs on the San Andreas Fault, California.
A fault line is the surface trace of a fault, the line of intersection between the fault plane and the Earth\'s surface.
Since faults do not usually consist of a single, clean fracture, geologists use the term fault zone when referring to the zone of complex deformation associated with the fault plane.