2 Fill in the blanks.
a. Meteors burn and appear as shooting
stars in the
(thermosphere/mesosphere).
(Carbon dioxide/Nitrogen) is the most abundant gas
present in the atmosphere.
c. Nitrogen(supports/does not support)combustion of fuels.
(Argon/Radon) is used
in the treatment of cancer.
e. Burning of fossil fuels releases
(nitrogen/carbon
dioxide) into the atmosphere.
f. Rusting of iron objects makes them
(strong/brittle).
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