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*THE CRUST, - uppermost thin layer, , beneath the Sial and the bottom of the, , ocean SIMA (Silicon & Magnesi, , average thickness is 33km, - volume - 1%, , “THE MANTLE, , - thickness — 2900 km, , continental crust — SIAL (silicon &Aluminum), , um), , - two maior parts — the upper mantle and lower mantle, , - the upper part of upper mantle is astheno:, plastic, , solid and as elastic solid., - arise convection currents in it, - supply energy for continental drift, volcanq, and earth quake., - volume — 83%, , *THE CORE, , - thickness: 2,900 to 6,371 km, , - outer core: Semi-molten, , -Inner core: Solid, , -Volume: 16%, , - made of iron and nickel called NiFe., , , , sphere in which the rocks behave as botha, , , , Earth Structure, , Continental crust -"Gramitic”, \eeanic crust ~“Basaltic®, , , , , , Peridotite (olivine & augite), , Iron & Nickel, , This is a compositional layering of the Earth ie. by what material the, layers are mode of,