4. CRUST
THE OUTER MOST LAYER OF EARTH IS CALLED
CRUST
CRUST CAN BE CLASSIFIED INTO TWO-OCEAN
FLOOR AND CONTINENTAL FLOOR
OCEAN FLOOR IS KNOWN AS “SIMA”
CONTINENTAL FLOOR IS KNOWN AS “SIAL”
OCEAN FLOOR IS MADE UP OF SILICA AND
MAGNESIA
CONTINENTAL FLOOR IS MADE OF SILICA AND
ALUMINIA
5. LITHOSPHERE
UPPER PORTION OF MANTLE AND CRUST
TOGETHER IS CALLED LITHOSPHERE
MAXIMUM THICKNESS OF LITHOSPHERE IS 100
KM
LITHOSPHERE IS FOUND AS 7 MAJOR AND
DESSON OF MINOR PLATES
6. MANTLE
JUST BELOW CRUST THERE IS MANTLE
MANTLE HAS TWO PART UPPER MANTLE AND
LOWER MANTLE
7. CORE
BELOW LOWER MANTLE THERE IS CORE
CORE IS IN TWO TYPE INNER CORE AND OUTER CORE
CORE IS MADE UP OF NICKEL AND IRON
CORE IS ALSO KNOWN AS NIFE
8. AESTHENOSPHERE
BETWEEN LOWER MANTLE AND UPPER MANTLE
THERE IS AESTHENOSPHERE
MAGMA FOUND IN AESTHENOSPHERE
