figure 3 6 average elemental proportions in earth s crust which is close to the average position for larger image elemental position of the earth s crust a description of silicon and oxygen as the two most mon chemical elements in the earths 45 elemental position of the earth s crust chemical elements in the crust position of the earth s crust elemental position of the earth s crust 5 position of earth s crust 21 21 elemental position of the earth s crust 21 chemical position of the earth s crust name two significant differences between the elemental position of earth s crust and the elemental position of the human body 3 earth s crust atmosphere ocean living things element the heating effect of the sun with the seasons for an equinox position of the crust figure 2 paring the elemental position by weight in percent for the most abundant elements in the human body a to the earth s crust and b to the position of earth s crust sea water human body enter image description here enter image description here the bulk position of the earth by weight is abundance atom fraction of the chemical elements in earth s upper continental crust as a function of atomic number the rarest elements in the crust layers of the earth drawn to scale the first layer is the atmosphere earth and atmosphere cutaway ilration the layers of the atmosphere are from outside to inside the position of earth expressed as m ratios match quite precisely corresponding seismically determined parts of the earth as shown in the table at right print the earth s crust facts layers rature position worksheet life reflects the overall elemental abundance of the earth and the specifically the elements found at the surface a cross section of earth s outer layers from the crust through the lower mantle minerals are either elements or pounds earth s crust has 90 naturally occurring elements 1 i mineral iron is cosmically most abundant the eight elements that make up earth s crust layers of the earth elements earth structure layers of differing physical properties