C
CARBON--Ordinary form is coal, crush it and diamonds are formed.
SiO2
Sand. Silicon and oxygen also make concrete bricks and glass.
He
HELIUM-Balloons are filled with helium and so is every star
H
HYDROGEN-Stars are also mostly Hydrogen that might someday fill your car.
Fe
IRON-The most abundant metal in our earth (35 %).Reacts with oxygen to form rust.
