Earth Sciences 1086F/G Lecture Notes - Lecture 7: Outer Core, Heavy Metals, Continental Drift
13 Jan 2020
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Chapter 7: earth: be familiar with, size, density and internal zones (layers) Earth grew by accretion- growth by the accumulation of smaller bodies, dust, and gas. Iron accounts for 30% of earth"s composition (most common element in the earth) Iron catastrophe: iron sinking to the planets core released more energy and caused the whole planet to melt. Earth was given a solid metal core, inside an outer core of liquid metal. Differentiation: the chemical zonation of heavier elements in the core, and lighter elements in the outer volume: name the zones of the earth (be able to label a simple diagram). Lithosphere: rocky layer that encompasses crust and uppermost portion of the mantle. Asthenosphere: layer of heat softened, slow moving (plasticy) rock. Mesosphere: below asphenosphere, high temperature but stiff plastic. The sun and earth both have an internal generator that gives a magnetic field. Magnetic fields radiate between earths north and south magnetic poles.
