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EARTH STRUCTURE (CRUST (oceaninc crust (DENSER THAN OTHER CRUST, MAINLY…
EARTH STRUCTURE
CRUST
50 to 70 km in depth
changing thickness
oceaninc crust
DENSER THAN OTHER CRUST
MAINLY MADE FROM IGNEOUS ROCK IRON AND MAGNESIUM
BETWEEN 5 & 10 KM THICK
FORMS SURFACE OF THE OCEAN BASIN
CONTINENTAL CRUST
35 TO 70 KM THICK
LESS DENSE
MAINLY GRANITE ROCK, FELDSPAR QUARTZ AND SILICA
HOW IT MOVES
MADE UP OF TECTONIC PLATES
BOUNDARIES CALLED FAULT LINES
OCEANIC AND CONTINENTAL LITHOSPHERE
FLOAT ON ASTHENOSPHERE
SEVEN MAIN ONES
AFRICA ANTARCTICA EURASIAN NORTH AND SOUTH AMERICA PACIFIC INDO - AUSTRALIAN
MANTLE
BETWEEN CRUST AND CORE
2 900 KM THICK
TWO LAYERS
UPPER MANTLE
670 KM THICK
BENDS AND FLOWS UNDER PRESSURE
SEMI MOLTON
BETWEEN 500 AND 900 * C
MADE UP OF IRON SILICA MAGNESIUM AND OXYGEN
LOWER MANTLE
2 230 KM THICK
SOLID
4000 *C
SAME MINERALS AS UPPER MANTLE
CORE
INNER MOST LAYER
INNER CORE AND OUTER CORE
INNER CORE IS THE HOTTEST
TEMP= 5 500 *C
SOLID MADE UP OF IRON AND NICKEL
1 220 KM TIBK
OUTER CORE SURROUNDS INNER CORE
LIQUID MADE OF IRON AND NICKEL
TEMP SIMILAR TO INNER CORE
2 250 KM THICK