Wind is the flow of gases. On Earth, wind is mostly the movement of air. In outer space, solar wind is the movement of gases or particles from the sun through space. The strongest winds seen on a planet in our solar system are on Neptune and Saturn.

Short bursts of fast winds are called gusts. Strong wings that go on for about a minute are called squalls. Winds that go on for a long time are called many different things such as a breeze, gale, hurricane, and typhoon.

Wind can move land, especially in deserts. Cold wind can sometimes have a bad effect on livestock. Wind also affects animals' food stores, their hunting and the way they protect themselves.

If there is a high pressure system (that rotates clockwise in the northern hemisphere) near a low pressure system (that rotates counter-clockwise), the air will move from the high pressure to the low pressure and try to even out the pressures. If there is a small difference in pressure, there will be breezes and light winds. If there is a big difference in pressure, the winds will be high and in some storms, such as hurricanes, cyclones, typhoons, or tornadoes, the pressure differences can cause winds faster than 200 mph (320 kph). This can cause damage to houses and other buildings, and can also lead to death.

Wind can also be caused by the rising of hot air, or the falling of cool air. When hot air rises, it creates a low pressure undernearth it, and air move in to equalize the pressure. When cold air drops (because it is denser or heavier than warm air), it creates a high pressure, and flows out to even out the pressure with the low pressure around it.

The wind is usually invisible, but rain, dust, or snow can let you see how it is blowing. A weathervane can also show you where the wind is coming form. The Beaufort scale is a way to tell how strong the wind is. It is used at sea, when no land can be seen.

The increase in wind causes an increase in the rate of evaporation.


High winds can cause damage depending on how strong they are. Sometimes gusts of wind can make poorly made bridges more or be destroyed, like the Tacoma Narrows Bridge in 1940. Power can go out because of wind, even if its speed is as low as 23 knots (43 km/h). This is because tree branches could change the flow of energy through power lines. No species of tree can resist hurricane-force winds, but trees with roots that are not very deep can be blown over easier. Trees such as eucalyptus, sea hibiscus, and avocado are brittle and are damaged easier.

In outer spaceEdit

Wind in outer space, called solar wind, is very different from wind on earth. The wind in outer space is caused by the sun, and it is made up of particles that came out of the sun's atmosphere. Like solar wind, the planetary wind is made up of light gases that have come out of planets' atmospheres.

Planetary windEdit

The doldrums are in the equatorial region. It is a wind belt where air is warm, with little pressure variations. winds are light there. Another name for doldrums is Intertropical Convergence Zone (ITCZ).

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