Chapter 11 - Earth's Structure and Internal Energy Chapter...

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1 Chapter 11 The Dynamic Planet Earth’s Structure and Internal Energy Resent research: detrital zircons (particles of preexiting zirconium silica oxides) in Western Australia dating to about 4.3 billion years old Earth’s Structure Earth’s Core Earth’s Mantle Earth’s Lithosphere and Crust Earth’s Structure Crust 0.5% Mantle 68.1% Core 31.4% (inner & outer) Continents only cover 29% of the earth’s surface Earth’s Core Inner core: solid iron well above the melting temp. of iron at the surface but remains solid because of tremendous pressure Iron Æ impure, probably combined with silicon and possibly with oxygen and sulfur Outer core: molten, metallic iron with a lighter density than inner core Earth’s Mantle 80% of Earth’s volume Rich in oxides of iron and magnesium and silicates Gradual temp. increase with depth and a stiffening due to increased pressure Gutenberg discontinuity: the transition zone from the outer core to the lower mantle (~2900 m) Ragged peak-and-valley like
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Chapter 11 - Earth's Structure and Internal Energy Chapter...

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