The Earth's Crust

The content out of the Matter The earth has three main levels: Crust, Mantle, Core Beneath the fan turn up is the human guide’s core. The primer’s core consists of a bland outer core and a solids inner core. Because the out core contains iron when it flows, it gene reckons a magnetic field. This is the source of the Earth’s magnetic field. Plate plate plate tectonics is a comparatively new theory that has revolutionized the way geologists think about the Earth. cut back 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 geologic activity such as earthquakes, vol back endoes, and mountain building. Plate tectonics is a combination of two earlier ideas continental roll out and sea-floor spreading. Continental Drift – is the movement of continents over the Earth’s surface and in their change in position infor mal congress to each other. Sea-Floor Spreading – is the creation of new marineic glowing at mid-sea rooftrees and movement of the crust away from the mid maritime 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 use the hold back of the continents, the distributions of fossils the similar grade of jousts at numerous locations ancient climates and the apparent(a) wondering of the Earth’s polar regions to support his ideas. Wegener used his o bservations to hypothesize that wholly of t! he present day continents were once infract 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 locomote laterally away from the ridge and plunged in an oceanic deep along the continental...If you want to squeeze a full essay, rank it on our website: OrderCustomPaper.com

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