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How many are the correct satements among...

How many are the correct satements among the following?
Troposphere is the majar portion of atmosphere.
.Stratosphere the region in which mainly ozone laye is present
.Sound waves cannot propagate in mesosphere.
.In mesosphere temperature falls with an increase in the altitude.
. Thermosphere is the region where the temperature increases with increase in altitude.
In thermosphere gases ionises by absorbing solar radiations.

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