Lecture_03 - LECTURE 3: EARTH'S CRUST AND PLATE TECTONICS...

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LECTURE 3: EARTH’S CRUST AND PLATE TECTONICS 1.0 EARTH’S PHYSICAL ARCHITECTURE CHEMICAL DIFFERENTIATION THREE LAYERS CORE - 10.7 (Fe, Ni) MANTLE - 4.5 (Fe, Al, Si, O - SILICATE MINERALS) CRUST - 2.8 (O, Si, Al - SILICATE MINERALS) BASALTIC & THIN (10 km) UNDER OCEANS GRANITIC & THICK (35 km) UNDER CONTINENTS COMPOSITION OF METEORITES IRONS, STONY-IRONS, STONY PHYSICAL DIFFERENTIATION OF SOLID EARTH FIVE LAYERS LITHOSPHERE ( A ROCK @ ) COOL, RIGID LAYER, ABOUT 70 KM THICK ASTHENOSPHERE ( A WITHOUT STRENGTH @ ) WEAK, HOT, PLASTIC DUCTILE LAYER, LOCALLY MELTED, EXTENDS 70 to 200 KM
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HOT, DENSE, RIGID LAYER, EXTENDS 200 TO 2,900 KM OUTER CORE HOT, MOLTEN Ni AND Fe LAYER, EXTENDS 2,900 TO 5,150 KM INNER CORE HOT, SOLID Ni AND Fe LAYER, EXTENDS 5,150 KM TO EARTH’S CENTER 1.1 SEISMIC WAVE PROPERTIES BODY WAVES P-WAVE - MOVES THROUGH SOLIDS AND LIQUIDS S-WAVE - MOVES ONLY THROUGH SOLIDS P-WAVE AND S-WAVE SHADOW ZONES EVIDENCE OF LIQUID OUTER CORE 1.2 THEORY OF PLATE TECTONICS ALFRED WEGENER - 1912
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Lecture_03 - LECTURE 3: EARTH'S CRUST AND PLATE TECTONICS...

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