Book 4, Question 81 · Video
Why Does the Wind Blow?
Wind is air on the move! The sun warms some places more than others. Warm air rises, and cooler air slides in to take its place. Wind is invisible. We see what it pushes, like flag
Read the full answer →What Crafty Clover says in this video
Intro
Hey there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why does the wind blow?
The Big Idea
Wind is air on the move! The sun warms some places more than others. Warm air rises, and cooler air slides in to take its place. That slide of air is what we call wind.
Sun Heats the Land
Step one: the sun heats the land. The sun doesn't warm everything evenly. Dark ground and dry land heat up faster than water or shady spots, so the air above them warms up more. Uneven heating is the secret behind wind.
Warm Air Rises
Step two: warm air rises, and cool air slides in. Warm air is lighter, so a patch of it lifts up. That leaves a gap, and the cooler air nearby rushes in to fill it. Air always flows from higher pressure toward lower pressure. That rush of air is wind!
Leaves Shake
Step three: moving air shakes the leaves. You can't see wind, but you can see what it pushes. Leaves shake, flags wave, and ripples race across water. At night, the land cools faster than the sea, so the breeze can reverse. The pattern shifts with the sun.
A Closer Look
Let's take a closer look at a sea breeze! In the afternoon, the land heats up faster than the water, so warm air rises above it. The water stays cooler, and the cool air over it is heavier. That cool air flows inland as an incoming breeze.
Quick Facts
Quick facts! Wind is invisible. We see what it pushes, like flags, leaves, and waves. Strong wind can snap branches, so that is a stay-inside day. Wind farms catch moving air and turn it into electricity. Hold on to hats near streets, and open umbrellas only on calm days.
Think Like a Scientist
Now, think like a scientist! With a grown-up, stand where you can see a flag or some leaves. Which way is the air going? What nearby surface might be warmer? Check again in the evening. Did the wind change?
Outro
Warm air rises, cool air rushes in, and the wind is born! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!