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heat pressure atmosphere air
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it's great fun for people to fly a kite in light wind what is wind high winds are very dangerous people can feel wind, hear wind but can't see wind
—Well, more trees ________ every year to stop the winD. A. must be planted can planted should planted planted
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It is very expensive to build a wind tunnel． Wind tunnels are very essential in testing planes． Scientists still have a lot to learn about wind tunnels． There are new ways to feed air to the test section．
are more dangerous are more harmful are more powerful are more welcome
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light winds clouds high winds loud sounds
Wind makes cold air higher and warm air lower. Wind can even carry cars and trucks to the sky. Wind makes all kinds of plants and flowers moving. Wind moves clouds in the sky and brings about rain.
moving air lighter clouds air pressure cold air
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