介绍:
Where does wind come from?
Antony Woodward and Rob Penn
authors
Wind is just air moving from one place to another.
The source of the wind, as of so many things, is the Sun. The Sun warms the Earth each day. When air warms up, it rises – this is the important bit – something has to take its place: more air that’s not so warm. As the warmed air rises, cooler air moves in to take its place, and – Presto! – that moving air is WIND.
Hurricanes and gales happen when the air is moving fast (because more air has risen, making room for lots more to rush in.) Gentle breezes are when it’s moving slowly, because less air has risen.
The atmosphere – the bubble of air around the Earth that we breathe – is warming and cooling and moving and mixing all the time, which is why our weather changes.
