___________ contains 75% of the atmosphere's gases and large amounts of water vapour and dust.

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

__________ is the densest part of the atmosphere.

___________ layer contains electrically charged irons that help in communication.

________ is an unique planet.

__________ is the most important gas.

Our knowledge about the atmosphere is based on the information received through ___________.

____________ gas required by plants for growth.

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

__________ is the coldest layer in the atmosphere.