__________ is the most important gas.

___________ layer contains electrically charged irons that help in communication.

The atmosphere is divided into ________ concentric layers.

Atmospheric ________ is used to make chemical fertilizers.

________ is an unique planet.

Life exists on the Earth primarily due to the _________ main realms.

_________ is the most prevalent gas in the atmosphere.

____________ gas required by plants for growth.

The amount of carbon dioxide in the atmosphere is gradually ___________.

___________ occupies about 29% of the total surface area of the Earth.