What is wind? Palm trees blowing during a storm. (Thinkstock)
What is wind?
Lexile

You asked us a question. What exactly is wind? And how does it get blown around?
 
Wind is a major player here on Earth. It sculpts landscapes. It brings rain and uproots trees along with lives.
 
So what's behind this invisible force that can tickle a cheek one second, and topple a building the next?
 
Good question. Wind is just air moving around. And air is just a bunch of dancing molecules. Gravity pulls down on the molecules. The closer they get to the Earth's surface, the more tightly packed they become.
 
Air that's under high pressure like that naturally flows to areas of low pressure. The bigger the difference in pressure, the faster the air flows. And that, my fellow geeks, is wind.
 
But what causes one area to be higher pressure than another? The sun. It heats the Earth's surface unevenly. That creates areas with warmer air. The warmer air rises, and then the cooler air rushes in.
 
All of these air movements happen at both local and global scales. Of course, it's all a lot more complicated than all of this. That makes wind and weather a little bit unpredictable.
 
Which is why I never leave home without my trusty cape.

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CRITICAL THINKING QUESTION
How can wind both uproot a tree and someone's life?
Write your answers in the comments section below


COMMENTS (24)
  • andrews1-rob
    4/07/2016 - 01:48 p.m.

    In order for the wind to uproot a tree or a person it would determine on how much the wind is blowing.

  • alvaror-rob
    4/07/2016 - 01:49 p.m.

    High pressure will move toward lower pressure. That can cause strong and fast winds that will make a tree get off it's roots. A tree landing on a human being can automatically take someone's life.

  • jonathons-rob
    4/07/2016 - 01:50 p.m.

    Wind can uproot a tree because sometimes wind is very strong and sometimes wind can be gentle and calm

  • thomash-rob
    4/07/2016 - 01:51 p.m.

    the way wind can uproot a tree or even someones life is by the pressure of the wind.

  • emmac-rob
    4/07/2016 - 01:53 p.m.

    Wind is unpredictable. Gravity pulls down on the wind molecules and the closer they get to Earth they become more tightly packed. The sun causes different ares to have higher pressures than others. That might be why wind can uproot a tree but also can uproot someones life.

  • jonathons-rob
    4/07/2016 - 01:53 p.m.

    Wind can uproot a tree because sometimes wind is very strong. Also wind can be calm and gentle and it will not hurt a fly. So from this lesson i learned that there are many types of winds and also when wind gets closer to earth the molecules become more tightly packed.

  • tylerm2542-rob
    4/07/2016 - 01:54 p.m.

    When wind gets closer to earth/ground level the wind strength picks up (the molecules get closer together). When the wind gets low enough the pressure gets stronger which allows the wind to sweep across the land. Then the wind rises to replace the high pressure and the high pressure replaces the spot of the low pressure system.

  • jacksonr-rob
    4/07/2016 - 01:54 p.m.

    Wind can pull trees out of the ground so if it can do that it can throw smaller things at your windows as well as other things.
    Wind can also harm you and your family.
    A big thing that wind can do is destroy your house and harm you financially.

  • dylans10-rob
    4/07/2016 - 01:54 p.m.

    Becuase wind can get more powerful or less by hot air and low air can make it stronger. all air is moveing molacles that move fast and the sun move in down. Soit get faster and stronger and by that it cand uproot a tree . that why you never leave home with out our trusty cape.

  • adriannas-rob
    4/07/2016 - 01:56 p.m.

    In order for wind to uproot a tree and a persons life it depends on the pressure. The closer they get to the earth's surface the more tightly pack they get.

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