Give the details of the different layers of the atmosphere and briefly describe the substances present in them.

(N/A) The atmosphere surrounding the earth is divided into concentric layers based on density and altitude.
$1$. Troposphere: This is the lowest region where humans and other organisms live,extending up to $\sim 10 \ km$ from sea level. It is a turbulent,dusty zone containing air,water vapour,and clouds,characterized by strong air movement and cloud formation.
$2$. Stratosphere: This region lies between $10 \ km$ and $50 \ km$ above sea level. It contains dinitrogen $(N_2)$,dioxygen $(O_2)$,ozone $(O_3)$,and a small amount of water vapour. The ozone layer in the stratosphere absorbs about $99.5 \%$ of harmful ultraviolet $(UV)$ radiation from the sun,protecting life on earth.