Five elements of the Periodic Table make up most of the earth's crust. Oxygen makes up 49.5% of the earth's crust. Silicon makes up 25.7% of the earth's crust. Aluminum makes up 7.5% of the earth's crust. Iron makes up 4.7% of the earth's crust. Calcium makes up 3.4% of the earth's crust. (9.2% ofContinue Reading →The post Periodic Table Elements That Make Up Earth's Crust appeared first on .
