Ozone is formed in the presence of UV radiation from…………
a) O & O
b) O2& O
c) O2& O2
d) O2& O3
The gas which protects the earth surface from UV radiation is…………
a) CO2
b) N2
c) O3
d) O2
Lowest temperature in troposphere is ………
a) 50C
b) -50C
c) 560C
d)-560C
