_________ is the most prevalent gas in the atmosphere.
Hydrogen
Oxygen
Nitrogen
Carbon dioxide
__________ is the lowest layer of the atmosphere.
Mesosphere
Troposphere
Stratosphere
Thermosphere
Our knowledge about the atmosphere is based on the information received through ___________.
Radars and satellites
Telescope
Aeroplane
Rocket
The two main gases present in the atmosphere are ____________.
Nitrogen and oxygen
Hydrogen and Nitrogen
Carbon dioxide and Hydrogen
The amount of carbon dioxide in the atmosphere is gradually ___________.
Increasing
Decreasing
Constant
Variable
___________ occupies about 29% of the total surface area of the Earth.
Atmosphere
Biosphere
Lithosphere
____________ gas required by plants for growth.
___________ layer contains electrically charged irons that help in communication.
Ionosphere
During photosynthesis green plants absorb ________.
Life exists on the Earth primarily due to the _________ main realms.
Two
Three
Four
Five
