It is made of O3 

Oxygen layer in atmosphere

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

Ozone formula : O3

The device that is used to measure temperature is called Thermometer .

Temperature measurement (also known as thermometry) describes the process of measuring a current local temperature for immediate or later evaluation. 

Chemical reactions that take place inside living things are called biochemical reactions. 

An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process.

The symbol of mercury is Hg .

Freezing point of mercury is -38.83C.

Boiling point of Mercury is 356.7 C.

Global warming is increasing the surface of earth .

It increase carbon dioxide , methane and other green house gases in atmosphere .