What does it feel like to ascend at:
a) 1 m s-1? b) 10 m s-1?
Relate this to the speed that a lift goes up. To work out the speed of a lift, divide the height the lift rises when it goes from one floor to another by the time taken to travel this height.
c) Is it safe for birds, gliders or indeed any other aircraft, to be caught in the upcurrents of a cumulonimbus cloud?
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2. Convection currents. Photo: NOAA
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