Lecture_03 - LECTURE 3: EARTHS CRUST AND PLATE TECTONICS...

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Lecture 3. Revised 8/08 1 LECTURE 3: EARTH’S CRUST AND PLATE TECTONICS 1.0 EARTH’S CHEMISTRY AND PHYSICAL ARCHITECTURE CHEMICAL DIFFERENTIATION OF EARTH THREE LAYERS CORE - 10.7 (Fe, Ni?) MANTLE - 4.5 (Fe, Al, Si, O - SILICATE MINERALS) CRUST - 2.8 (O, Si, Al - SILICATE MINERALS) UNDER OCEANS CRUST IS BASALTIC & THIN (10 km) UNDER CONTINENTS CRUST IS GRANITIC & THICK (35 km) CHEMICAL COMPOSITION OF METEORITES STONY, STONY-IRONS, IRONS PHYSICAL DIFFERENTIATION OF EARTH FIVE LAYERS LITHOSPHERE ( ROCK ) COOL, RIGID LAYER, ABOUT 70 KM THICK ASTHENOSPHERE ( WITHOUT STRENGTH )
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Lecture 3. Revised 8/08 2 WEAK, HOT, PLASTIC DUCTILE LAYER, LOCALLY MELTED, EXTENDS FROM 70 to 200 KM BELOW THE EARTH’S SURFACE MESOSPHERE HOT, DENSE, RIGID LAYER, EXTENDS FROM 200 TO 2,900 KM BELOW THE EARTH’S SURFACE OUTER CORE HOT, MOLTEN Ni AND Fe LAYER, EXTENDS 2,900 TO 5,150 KM BELOW THE EARTH’S SURFACE INNER CORE HOT, SOLID Ni AND Fe LAYER, EXTENDS 5,150 KM BELOW THE EARTH’S SURFACE TO THE
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Lecture_03 - LECTURE 3: EARTHS CRUST AND PLATE TECTONICS...

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