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LAYERS OF THE EARTH / 3 SUBDIVISIONS OF THE GEOSPHERE / FORMED DUE TO DIFFERENTIATION
1. CRUST
2. MANTLE
3. CORE
CRUST
-EARTH'S THIN AND ROCKY SKIN
OCEANIC CRUST
- USUALLY FOUND BENEATH OCEANS AND LARGE BODIES OF WATER
-MADE UP OF BASALTIC ROCKS RICH IN FERROMAGNESIAN MINERALS
-7KM THINNER THAN CONTINENTAL CRUST
CONTINENTAL CRUST
-THICKER (MAY EXCEED 70KM ESPECIALLY IN MOUNTAINOUS REGIONS)
-DOMINATED BY GRANITIC ROCKS
MANTLE
-EXTENDS DEEPER THAN THE CRUST
- COMPRISES 82% OF THE EARTH'S TOTAL VOLUME
-THE ROCKS FOUND IN THIS LAYER ARE MORE RELATED TO DENSER ELEMENTS SUCH AS Fe AND Mg ( SIMILAR TO OCEANIC CRUST MATERIALS)
-ACCOUNTS FOR ABOUT 2/3s OF EARTH'S TOTAL MASS
WHERE IDEAS ABOUT THE MANTLE CAME FROM
1. SEISMOLOGICAL DATA
2. NATURE OF METEORITES
3. MATERIALS FROM THE MANTLE THAT HAVE BEEN EJECTED TO EARTH'S SURFACE BY VOLCANOES
SUBDIVISIONS OF MANTLE - DUE TO PRESSURE DIFFERENCES
1. UPPER MANTLE
2. LOWER MANTLE
UPPER MANTLE
EXTENDS FROM THE BOTTOM OF THE CRUST TO A DEPTH OF 660KM
SUBDIVISIONS OF THE UPPER MANTLE DUE TO PRESSURE AND COMPOSITIONAL DIFFERENCES
1. LITHOSPHERE
2. ASTHENOSPHERE
LITHOSPHERE
STIFF PORTION OF THE UPPER MANTLE AND THE WHOLE CRUST ABOVE IT.
COOL, RIGID, BRITTLE
CALLED "STONE SHELL"
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