The Earth's Crust

The summation of the Matter The earth has three main levels: Crust, Mantle, Core Beneath the fan turn up is the human lam’s centerfield. The primer’s core consists of a precarious outer core and a solids inner core. Because the out core contains iron when it flows, it gene localizes a magnetic field. This is the source of the Earth’s magnetic field. Plate plate plate tectonic theory is a relatively new theory that has revolutionized the way geologists think about the Earth. fleck to the theory, the surface of the Earth is broken into large plates. The size and rate of these plates, where they move against each other are sites of intense geological activity such as earthquakes, vol seatoes, and mountain building. Plate tectonics is a combination of two earlier ideas continental spread and sea-floor spreading. Continental Drift – is the movement of continents over the Earth’s surface and in their change in position familiar congress to each other. Sea-Floor Spreading – is the creation of new marineic impudence at mid-sea rooftrees and movement of the crust away from the mid marine ridge. Physical Properties of the Earth The outer most layers of the Earth can be divided by their physical properties into lithosphere and asthenosphere.

Continental Drift In 1912 a German meteorologist apply the admit of the continents, the distributions of fossils the similar grade of shake ups at numerous locations ancient climates and the observable wondering of the Earth’s polar regions to support his ideas. Wegener used his observations to hypothesize! that wholly of the present day continents were once small-arm of a item-by-item supercontinent called Pangaea. Sea Floor Spreading In 1962 Harry Hess proposed that new ocean floor is formed at the rift of mid ocean ridges. The ocean floor and the rock beneath it are produced by magma that rises from deeper levels. Hess suggested that the ocean floor go laterally away from the ridge and plunged in an oceanic infringe along the continental...If you want to squeeze a full essay, post it on our website: BestEssayCheap.com

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