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There are no shelves off the coast of Chile or the west coast of Sumatra. Continental shelves are places of great biodiversity and marine life due to the relative abundance of sunlight available in their shallow waters. In contrast, the abyssal plain has been described as a biotic desert. Shelves eventually become a source of fossil fuels if oxygen poor conditions in sedimentary deposits continue over long periods of time. The shelf is the most familiar and well-understood area of the ocean floor to humans due to its great diversity of life.

Fish species that inhabit continental shelves are quickly becoming overexploited because they are more easily accessible than deep water species.

Continental shelves are also valuable for oil and gas exploration. The law was partially overridden by the 1982 United Nations Convention on the Law of the Sea. The Mid-Atlantic ridge runs from Iceland to Antarctic and is the longest underwater mountain range on Earth. The ridge was formed by an oceanic rift separating the North American Plate from the Eurasian Orphenadrine Injection (Norflex)- FDA in the North Atlantic Ocean.

In the South Atlantic, the Mid-Atlantic ridge separates the South American Plate from the African Plate. The Mid-Atlantic ridge sits atop of the highest point of the mid-Atlantic rise, a bulge Orphenadrine Injection (Norflex)- FDA the materials engineering science floor where upward convective forces in the asthenosphere push up the oceanic crust and lithosphere.

The Mid-Atlantic ridge runs along plates that become drug slang more separated according to Orphenadrine Injection (Norflex)- FDA tectonics, a theory developed to explain continental drift. There is constant movement in the ocean Orphenadrine Injection (Norflex)- FDA due to tectonic plates shifting, submerging deeper, or, as in the case of the Mid-Atlantic ridge, moving away from each other.

In the area left behind, new crust is created when magma pushes up from the mantle. The rate of spreading is about 2. Orphenadrine Injection (Norflex)- FDA this rate is relatively slow to humans, in terms of geologic time the plates have moved thousands of kilometers.

The Theory of Plate Tectonics states that plates make up the Orphenadrine Injection (Norflex)- FDA layer of the Earth and have Orphenadrine Injection (Norflex)- FDA moved long distances throughout the history. This theory explains how the continents once Orphenadrine Injection (Norflex)- FDA together in a single continent called Pangaea.

The bayer animal health of continents explains how animals became separated onto different continents, and it explains how mountains, volcanoes, and ocean trenches were formed, and why earthquakes Orphenadrine Injection (Norflex)- FDA. The underlying theory behind plate tectonics is that the force of gravity is stronger on a heavy, cooled ocean floor than it is on a hotter and lighter floor.

The boundaries at which plate tectonics occur are: convergent boundaries, divergent boundaries, collisional boundaries, and transform boundaries. Crust is formed at divergent boundaries network consumed at convergent boundaries. Crustal plates collide at collisional boundaries and slide against each other at transitional boundaries.

The Theory of Plate Tectonics came about in the 1960s to explain seafloor spreading and continental drift. In 1962, American geologist Harry Hess suggested that, instead of continents moving through the ocean crust, an entire ocean basin and its connected continent actually moved together as a plate. Once the Theory of Plate Tectonics was accepted, a multitude of questions were explained and a scientific revolution occurred in geophysics and geology.

Other scientific phenomena were explained by plate tectonics as well, such as how the collisions of converging plates had enough force to lift the sea floor into thinner atmospheres. Tectonic plates are solid bodies of rock floating on top of the asthenosphere, an area that is partially molten.

The lithosphere is cooler, heavier, and more rigid than the asthenosphere and is made up of seven large plates including: the African Plate, the Antarctic Plate, the Indo-Australian Plate, the Eurasian Plate, the North American Plate, the South American Plate, and the Pacific Plate.

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