FACTS ABOUT EARTH OUR INNER EARTH Our earth is made up of several layers with one inside another It consists of three layers CRUST · Outermost layer · Thinnest of all the layers · It is 35km thick in continents and 5km in ocean flours · Main constituent of ocean mass are silica and alumina · Constituent of ocean flour is silica and magnesium MANTLE · It is just below crust upto 2900km · It is solid but some of its inner side it is in liquid state · This part has 67% of the mass of earth CORE · Innermost layer of earth · It is mainly made up of nickel and iron · It has a very high temperature and pressure · It has inner core and outer core