Define A Ocean Floor Rift

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The Ocean Floor Foldable Notes H G Define Oceanography Ppt Download Ocean Science Oceanography Marine Biology

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The most popular mechanism for this outward movement is sliding along the volcano ocean floor interface which consists of easily deformable sediments e g.

Define a ocean floor rift.

Ocean definition the vast body of salt water that covers almost three fourths of the earth s surface. Running over 10 000 miles through the atlantic ocean the mid atlantic ridge is the longest mountain range on the planet. This divergent plate boundary moves apart at a rate of 2 5 cm per year relatively slow for a divergent plate boundary and rises 2 3 km above the ocean floor. Rift valleys usually form where the earth s lithosphere has become thin through extension associated with plate tectonic processes.

A long narrow valley lying between two normal geologic faults. When she inked in and cross hatched the spaces the topographical profile of the north atlantic was evident with mountains and plains and a very obvious mid ocean rift valley indicating continental drift a horrifying concept for geologists to grasp in 1952. Individually ocean ridges are the largest features in ocean basins. Oliver and bryan l.

Hess theory was that new seafloor is formed when magma is forced upward toward the surface at a mid ocean ridge. Isacks had integrated this notion of seafloor spreading with that of drifting continents and formulated the basis of plate tectonic theory. Stress orientation of its huge neighbor and has adopted the same rift zone orientation from fiske jackson 1972. A rift valley is a lowland region that forms where earth s tectonic plates move apart or rift rift valleys are found both on land and at the bottom of the ocean where they are created by the process of seafloor spreading rift valleys differ from river valleys and glacial valleys in that they are created by tectonic activity and not the process of erosion.

Oceanic ridge continuous submarine mountain chain extending approximately 80 000 km 50 000 miles through all the world s oceans. By the late 1960s several american investigators among them jack e. If spreading continues past the incipient stage described above two of the rift arms will open while the third arm stops opening and becomes a failed rift or aulacogen. As the two active rifts continue to open eventually the.

Rift valley definition graben.

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