Engineers from Sierra Space, a private company, have developed a machine designed to extract oxygen from lunar soil, also ...

Cadmium is a naturally occurring metal found in the Earths crust, usually in combination with other elements such as oxygen, ...

Also read The Mystery of Strange Space Signals May Finally Be Solved Oxygen comes in second, making up around 30% of the ...

with little or no free oxygen. Iron sinks deep inside Earth and forms its core. Lighter elements like silica, magnesium, and aluminum rise to the surface, and later harden to form the outer crust.

Most of the atmosphere is nitrogen (80%) with around 20% oxygen and other trace gases. The Earth has a layered structure made up of the crust, the mantle, the outer core and the inner core.

The Earth has a layered structure made up of the core, the mantle and the crust. Different elements are present in different parts of the Earth’s structure. The crust is made from enormous ...