The internal structure of the earth

Layer / Characteristics Crust Mantle Core Technical name Lithosphere AsthenosphereMesosphere Barosphere Meaning of the root word Rocky weak , middle Pressure Sub layers SIAL and SIMA Upper and lower outer and inner Extent 6 - 50 km 35 - 2900 km 3000 - 3500 km Chemical composition Si, Al and Mg Mg, Fe and S Ni, Fe and other heavy metals. Density 2.7 - 3.0 g 3.0 - 5.0 g/ cu.cm 14 - 16 g Temperature 14 - 20 deg c 1000 - 3000 deg c 4000 - 6000 deg c Discontinuity Mohorovicic Mohorovicic and Gutenburg Gutenburg Other information Granite and basalt Longest layer Extreme temperature and pressure Other names Mineral layer middle layer NiFe