During photosynthesis green plants absorb ________.

____________ gas required by plants for growth.

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

__________ is the coldest layer in the atmosphere.

__________ is the densest part of the atmosphere.

Nitrogen , oxygen and ________ are important gases .

The atmosphere is divided into ________ concentric layers.

___________ layer contains electrically charged irons that help in communication.

_________ is the most prevalent gas in the atmosphere.

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