There are three modes of transferring heat into and through the atmosphere namely –
a) Convection
b) Conduction
c) Radiation
The heat transfer mechanism is a fluid (air or water) is called convection. The atmospheric air acts as a fluid. The earth gets heated by the sun’s radiation. This heated earth makes the air surrounding it to get warm than the air around it. The heated air mass rises up , where it eventually gets cool through convection.
The answer is C. The widely used technique for finding extraterrestrial life is use of SETI (search for extraterrestrial intelligence) dishes that listen for radio waves from outer space. NASA has also been sending radio waves to outer space with messages that could purportedly be decoded by alien intelligent life.
