If there were no atmosphere around the earth, the temperature of the earth will
(a) increase
(b) go on decreasing
(c) increase during day and decrease during night
(d) be unaffected
The atmosphere of the earth is heated by radiations which are mainly
(a) radiated by the sun
(b) re-radiated by land
(c) re-radiated by water
(d) re-radiated by land and water
Becoming exposed to or infected with an infectious microbe does not necessarily mean developing noticeable disease. Explain.
Why do some children fall ill more frequently than others living in the same
locality?
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