Rust diseases of wheat, the most common these days is called leaf or brown rust and is caused by P. triticina Eriks.

It is made of O3 

Oxygen layer in atmosphere

Ozone protects us from the harmful ultraviolent radiations of the sun.

Ozone formula : O3

Ozone protects us from the harmful ultraviolent radiations of the sun.

Ozone formula : O3

Hydrogen is the most abundant element in the Universe.

Helium is second making up almost all of the remaining 25%. Oxygen is third most abundant element of universe.

As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation.

Pressure measures force per unit area, with SI units of pascals (1 pascal = 1 newton per square metre, 1 N/m2).