The East African Rift is a continental divergent boundary in East Africa. Two plates are pulling apart from each other. These collisions result in the creation of volcanic mountains that can surface above the ocean as small island chains. The transform boundary belt runs along the western border of the Southern Alps. A convergent continental-continental boundary refers to a convergent plate boundary where two continental plates meet or come together. Convection pushes the thick plate upward, stretching and fracturing it, forming a rift. These are the , many bearing names, that are a major source of.
. You've just boiled an egg and are removing the shell. Continental divergent boundaries form rift valleys such as the East African Great Rift Valley. However, some regions like the transform boundaries, which although tectonically active, are the silent revolutionaries, as they do not alter the shape of the Earth phenomenally. It is a long linear crack made by the plates moving apart. Instead, it fills the fissure and solidifies. Volcanic island arcs are associated with what type of plate boundary? When two oceanic plates diverge, underwater ridges and mountain ranges form, such as the mid-Atlantic Ridge.
These boundaries form the global mid-ocean ridge system which is the largest mountain chain on Earth. A sea floor map will show a rather strange pattern of blocky structures that are separated by perpendicular to the ridge axis. When a convergent boundary occurs between two oceanic plates, one of those plates will subduct beneath the other. This also is an example of a triple junction, with the Explorer ridge and Cascadia subduction zone in the south forming the other two elements. The magnetite in the basalt rocks forms a zebra like pattern on the ocean floor. A rift or deep valley may appear over time or land may split into distinct land masses with the surrounding water filling the space between them. Here the thick continental plate is arched upwards from the convection current's lift, pulled thin by extensional forces, and fractured into a rift-shaped structure.
When this happens, magma rushes up to fill the gap, creating brand new crust. Features of Convergent Boundaries Convergent boundaries are where the tectonic plates meet. When two continental plates collide, the impact is so significant that the material in the subduction zone is pushed upwards. Transform faults end at the junction of another plate boundary or another fault. If rifting continues, a new ocean basin could be produced. Earthquakes occur as a result of this fracturing and movement. The ridge is a high area compared to the surrounding seafloor because of lift from 4 mar 2017 best examples for divergent plate boundaries are east african rift ear another tectonic boundary on in tectonics, or linear feature that contents.
Highest mountain, deepest lake, biggest tsunami and more. The Pacific plate is converging with the South American plate. More Plate Tectonic Links There are large and small plates that cover the Earth. The world is ever changing and so must the growing knowledge of mankind. With continued development the islands grow larger, merge, and an elongate landmass is created. Tectonic plates do not just drift on this upper mantle. A continental volcanic arc is an arc-shaped chain of volcanoes that form from the subduction of an oceanic plate under a continental plate.
In plate tectonics, a Divergent boundary or divergent plate boundary also known as a constructive boundary or an extensional boundary is a linear feature that exists between two tectonic plates that are moving away from each other. It is more a matter of whether the boundary itself lies over an ocean or land than whether the plates are continental or oceanic. This rift can then grow deeper and wider. The Andes Mountain Range of western South America is another example of a convergent boundary between an oceanic and continental plate. The banding furnishes a map in time and space of both spreading rate and polar reversals. Iceland is situated on this particular ridge and is therefore slowly splitting in half. As the rift grows deeper it might drop below sea level, allowing ocean waters to flow in.
As new crust is formed, other plates are pushed by the spreading ocean floor. The northern part of the Pacific Plate is subducting under the North American Plate, and the result is the formation of the Aleutian Islands. In the upper mantle where the plates are separating molten rock forms in magma chambers. Scientists date the age of the crust by comparing the alignment with known magnetic reversals. Continental plates are the part that lies above sea level, but again, the real definition is that the crust is made of granite and other felsic rocks.
However, continental plates are far thicker than oceanic ones. These occur where their names have defined, within the oceanic crust and the continental crust. The Ridge is a high area compared to the surrounding seafloor because of the lift from the convection current below. Scientists are currently studying this ridge in Iceland, where the boundary runs right in the middle ofthe island, and will split the island in the future Another example of this oceanic boundary is the pacific Ridge, which is the fastest spreading mid ocean ridge; and is home to the discovery of hydrothermal vents, which are the result of the boundary. Thus as the plates pull apart, it leaves a gap through which the magma can travel and erupt as lava.