Up, Up & Away: Crash Course Kids #16.2 - By Crash Course Kids
Transcript
| 00:0-1 | here's a riddle for you . What's something you can't | |
| 00:01 | see , but something you can feel . I'll give | |
| 00:04 | you a hint . It sounds a bit like this | |
| 00:06 | . Hold onto your hats , because today we're talking | |
| 00:10 | about wind last time we learned about how the land | |
| 00:23 | absorbs more energy from the sun than the water does | |
| 00:26 | . And it turns out this unequal heating of the | |
| 00:28 | Earth's surface is what produces wind . You heard me | |
| 00:30 | ? Wind is part of the atmosphere , but it's | |
| 00:33 | often caused by two of the other spheres , the | |
| 00:35 | geo sphere and the hydro sphere . Remember those ? | |
| 00:38 | But what exactly is wind ? And how does the | |
| 00:41 | sun's energy create it ? Well , when does air | |
| 00:47 | in motion ? It's the flow of large amounts of | |
| 00:50 | air , usually from a high pressure area to a | |
| 00:52 | low pressure area . When I say pressure , I | |
| 00:54 | mean , the amount of force that air in the | |
| 00:56 | atmosphere puts on an object on Earth , which I | |
| 00:59 | assume is where you are right now . How much | |
| 01:01 | pressure the air exerts on stuff mainly has to do | |
| 01:03 | with its temperature . Specifically , cool air produces high | |
| 01:06 | air pressure and warm air produces low air pressure . | |
| 01:09 | So with all that in mind , let's take a | |
| 01:11 | look at how the hydro sphere and the geo sphere | |
| 01:13 | can work together to create wind . A good place | |
| 01:15 | to start . Is that same beach spot we visited | |
| 01:17 | in the last lesson there . You'll remember the land | |
| 01:19 | absorbs more of the sun's heat . So it has | |
| 01:21 | a higher temperature . Those warmer landforms heat the air | |
| 01:24 | above them and that hot air has lower air pressure | |
| 01:27 | . Meanwhile the nearby water absorbs less heat and is | |
| 01:30 | cooler so it heats the air less and creates higher | |
| 01:32 | air pressure . When those two environments with different temperatures | |
| 01:35 | and different pressures are basically next door to each other | |
| 01:38 | . Air rushes from one place to another to try | |
| 01:40 | to balance out the differences you and I call that | |
| 01:43 | rushing air wind does this wind cycle stay the same | |
| 01:46 | all day , every day , nope . But it | |
| 01:48 | does follow a pattern and if you want to see | |
| 01:50 | how that wind cycle works well , I hope you | |
| 01:52 | packed your jammies because we're going to have a sleepover | |
| 01:54 | on the beach . Mm Here's our little beach during | |
| 02:00 | the daytime with the hot sand on one side and | |
| 02:02 | the cool ocean right next to it . When the | |
| 02:04 | sun shining down on it , the land heats up | |
| 02:06 | faster than the ocean . The warm air over the | |
| 02:09 | land rises and the heavier , cooler air from the | |
| 02:11 | water rushes in to take its place . This causes | |
| 02:14 | what's called a sea breeze that blows from the ocean | |
| 02:17 | on to the land . But what if you visit | |
| 02:19 | the beach at night during the evening , the land | |
| 02:21 | will cool down faster than the ocean and the opposite | |
| 02:24 | cycle will happen at night . Warm air over the | |
| 02:26 | water will rise and the heavier , cool air from | |
| 02:29 | the land will blow out to the ocean . This | |
| 02:31 | is called a land breeze . This model is just | |
| 02:33 | one example of a common wind pattern . There are | |
| 02:35 | different kinds of winds all over the world , but | |
| 02:37 | for the most part they follow patterns based on what | |
| 02:39 | conditions are like nearby . Mhm . So wind isn't | |
| 02:46 | just air randomly moving from one place on earth to | |
| 02:48 | another . It's the movement of air that follows a | |
| 02:51 | pattern usually blowing from high pressure areas to low pressure | |
| 02:53 | areas . And these patterns are caused by uneven heating | |
| 02:56 | on the earth's surface . Is while this model we | |
| 02:58 | created might look pretty tame . Don't be fooled . | |
| 03:01 | Wind isn't always just a gentle breeze . The fastest | |
| 03:04 | winds on earth occur inside tornadoes where they can reach | |
| 03:06 | a speed over 400 kilometers per hour , and that's | |
| 03:09 | nothing compared to wind on other planets . In our | |
| 03:11 | solar system , Neptune has , winds can gust up | |
| 03:14 | to 2000 kilometers an hour . Wind can be a | |
| 03:16 | really powerful force of nature . I guess you could | |
| 03:19 | say I'm a big fan and sorry if you got | |
| 03:21 | sand in your jammies , but it was worth it | |
| 03:23 | to learn about the wind , right . |
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