Geo101.08.EarthCore[1]

Geo101.08.EarthCore[1] - 1 Earths Core and the Geodynamo...

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Unformatted text preview: 1 Earths Core and the Geodynamo System Earths Core Earths Core Earths Core The Geodynamo System is that system that owes its origination in Earths Outer Core. Its effect as a result of the generation of Earths magnetic Feld reaches far into outer space producing a protective shield that permits the development of Earths complex atmosphere and complex biological life. Formation of Proto-Planet Dust particles collide and stick together, forming planetesimals. Gravity reshapes the proto-Planet into a sphere. The interior of the Planet separates into a core and mantle. orming the planets from planetesimals: Planetesimals grow by continuous collisions. Gradually, an irregularly shaped proto-Earth develops. The interior heats up and becomes soft 2 molten Fe because of its density and gravitational interactions, began to sink to the center of the early Earth Planetary Cores Subdivisions of the Earth We can also infer whats at the center of the Earth. The S-wave shadow zone is observed as shear waves cannot pass through the liquid outer core So we knowEarth's iron core consists of a solid inner core about 1,500 miles (2,400 kilometers) in diameter (about the size of the moon) and a uid outer core measures about 4,200 miles (7,000 kilometers) across, about the diameter of Mars! 1) External Sources ...primarily the Sun 2) Internal Sources Radius = 6370 kilometers = 4000 miles One question we want to ask is what is the source(s) of Earths Heat / Energy? 3 As the proto-Earth grew in size its increased gravitational feld would have attracted even more particles / planetary bodies. The composition oF these colliding particles and planetary bodies included metal-rich Fragments (i.e.., iron meteorites ), rocky Fragments (i.e., stony meteorites ), and icy Fragments (i.e., comets ). Such particles travel at great velocities, typically ~30,000--50,000 km/hr, similar to that oF the Earth as it rotates around the Sun....
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This note was uploaded on 04/03/2011 for the course GEOLOGY 939 taught by Professor Swisher during the Spring '11 term at Rutgers.

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Geo101.08.EarthCore[1] - 1 Earths Core and the Geodynamo...

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