___________ holds about 90% of all the ozone,which protect us from harmful ultraviolet sun rays.

Which one of the following layer is very important for human,plant and animal life?

Which layer is warm near the surface of Earth?

_________ extends to a height of about 1050 kilometers.

_________ extends up to a height of about 80 kilometres.

Which is the coldest layer in the atmosphere?

_________ is calmer than the troposphere and has little water vapour.

Aeroplanes fly in ___________ layers.

_________ is regarded as the breath of life.

The air surrounding the Earth is called the