Two Writing Teachers is hosting Poetry Friday today! One of our favorite illustrators, Grace Lin, joined by author Ranida McKneally, didn't just celebrate autumn (and the other seasons) in Our Seasons, they told us how the weather works and how it effects us humans. Pretty haikus are accompanied by scientific explanations.
Here's one perfect for today:
Punching the blue sky,
The wind shows off its poer.
Ki-Ki almost flies
Then we learn what makes the wind: "Air moves when there's a difference in air pressure from one area to another. Air pressure is the weight of air pushing down from above. Most differences in air pressure are caused by the sun's heat. Because the sun heats the earth unevenly, the air is warmer insome places than in others. Warm air doesn't press down as much as cold air, so we say it has low pressure. Cold air has high pressure--when air is cooled, it shrinks and sinks.
When air is heated, it expands and rises. As warm air rises, cold air flows in from surrounding areas to replace the rising air. Air always moves from areas of high pressure to areas of low pressure. When air moves you feel it as wind."
Posted by Donna
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