The atmosphere is divided into ________ concentric layers.
Three
Four
Five
Six
____________ gas required by plants for growth.
Carbon dioxide
Oxygen
Nitrogen
Hydrogen
___________ refers to the soil or the crust of the Earth.
Lithosphere
Exosphere
Mesosphere
Stratosphere
The two main gases present in the atmosphere are ____________.
Nitrogen and oxygen
Hydrogen and Nitrogen
Carbon dioxide and Hydrogen
Life exists on the Earth primarily due to the _________ main realms.
Two
___________ contains 75% of the atmosphere's gases and large amounts of water vapour and dust.
Ionosphere
Troposphere
__________ is the most important gas.
oxygen
__________ is the densest part of the atmosphere.
Atmospheric ________ is used to make chemical fertilizers.
Our knowledge about the atmosphere is based on the information received through ___________.
Radars and satellites
Telescope
Aeroplane
Rocket