INTERIOR STRUCTURE OF THE EARTH

INTERIOR STRUCTURE OF THE EARTH - INTERIOR STRUCTURE OF THE...

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INTERIOR STRUCTURE OF THE EARTH
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Seismic waves and Earth’s structure The rather abrupt changes in seismic- wave velocities that occur at particular depths helped seismologists conclude that Earth must be composed of distinct shells Layers are defined by composition Because of density sorting during an early period of partial melting, Earth’s interior is not homogeneous
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Seismic waves and Earth’s structure Layers defined by composition Three principal compositional layers Crust – the comparatively thin outer skin that ranges from 3 kilometers (2 miles) at the oceanic ridges to 70 kilometers (40 miles in some mountain belts) Mantle – a solid rocky (silica-rich) shell that extends to a depth of about 2900 kilometers (1800 miles)
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Seismic waves and Earth’s structure Layers defined by composition Three principal compositional layers Core – an iron-rich sphere having a radius of 3486 kilometers (2161 miles) Layers defined by physical properties With increasing depth, Earth’s interior is characterized by gradual increases in tem- perature, pressure, and density
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Seismic waves and
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This note was uploaded on 07/17/2008 for the course GS 100 taught by Professor Leavell during the Spring '06 term at Ohio State.

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INTERIOR STRUCTURE OF THE EARTH - INTERIOR STRUCTURE OF THE...

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