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THE GREAT AQUA ADVENTURE - Contenido educativo

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Subido el 14 de abril de 2022 por Alicia M.

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This is a glass of water, and it's been on a long, long trip. 00:00:00
I'm serious. It didn't pack any bags or take any selfies along the way, 00:00:04
but this water has been around the world many, many times. 00:00:08
Think I'm crazy? I'm not. 00:00:15
This water is part of a long, worldwide system called the water cycle. 00:00:23
The water cycle explains the way water moves on, above, and below the Earth. 00:00:27
And it's huge! 00:00:32
It includes every giant glacier and every tiny little puddle. 00:00:33
It includes the water at the bottom of the ocean and the water in the clouds in the sky. 00:00:36
As you know, water is matter. 00:00:41
And we've learned that matter can change states. 00:00:43
It can be a solid, a liquid, or a gas. 00:00:45
For water, that means it can be ice, liquid water, or water vapor. 00:00:48
And as all of this water, which makes up the hydrosphere, winds its way around the world, 00:00:52
it interacts with the other three spheres. 00:00:56
It starts, as many things do, with the sun. 00:00:58
Hey, buddy! 00:01:01
As the sun sends its energy down to the earth, the surface of the oceans and lakes are heated until some of the liquid water turns into a gas, water vapor. 00:01:02
This process is called evaporation. 00:01:15
Have you ever dried off in the hot sun after a dip in the pool? 00:01:17
If you have, you've experienced evaporation. 00:01:20
After the water evaporates, the water vapor rises higher and higher into the atmosphere. 00:01:23
As it goes up, it starts to cool, which makes a lot of sense. 00:01:28
You've probably noticed that the tops of tall mountains are cold and snowy. 00:01:31
Sometimes, even in the summer. 00:01:35
So as the water vapor rises, it eventually gets cooler and starts to turn into liquid. 00:01:36
This is called condensation. 00:01:41
All those little water molecules start sticking together, along with the particles of dust 00:01:43
and other tiny bits of stuff, turning into a mass of small drops of condensed water that 00:01:46
we call clouds. 00:01:51
And when it's all snuggled up in the clouds, water can do some serious traveling, because 00:01:52
wind and other air currents can push clouds over long distances, so the water in the clouds 00:01:57
above you may have originally been picked up over a faraway ocean. 00:02:02
Now, if enough water particles in a cloud stick together, then the water will fall out. 00:02:05
And when it does, it's called precipitation. 00:02:10
It takes millions of cloud droplets to produce just one raindrop. 00:02:13
If the clouds are cold enough, they can form other kinds of precipitation, too. 00:02:17
Ice crystals can form in the clouds, for example, growing bigger and heavier until they fall 00:02:21
in the form of snow, sleet, or hail. 00:02:25
No matter what form it takes, though, once the water falls, it can go in a couple of 00:02:28
different routes. 00:02:32
Some of the water will hit the ground and run towards streams and rivers, where it will 00:02:33
eventually join the ocean. 00:02:36
Some of it will soak into the ground through tiny pores in the soil. 00:02:38
This water can collect and hang out underground for years until it slowly moves into the sea. 00:02:41
Or it can be pumped up to be used as drinking water. 00:02:46
And some of that water that rained down will also quickly be evaporated again. 00:02:49
This whole process – evaporation, condensation, and precipitation – is repeated over and 00:02:53
over, moving water all around the world, empowering weather events. 00:02:59
We have the water cycle to thank for hurricanes, blizzards, and that rainstorm that caught 00:03:03
me outside without an umbrella the other day. 00:03:07
But you can also watch the water cycle happen in your own kitchen. 00:03:09
Let's investigate. 00:03:13
First, pour hot water into a clear bowl, then cover it with plastic wrap and place a few 00:03:18
ice cubes on top. 00:03:22
In this experiment, the hot water is water that has been heated by the sun, and the wrap 00:03:23
with the ice cubes is the cool atmosphere. 00:03:27
Molecules in the hot water rise in the form of water vapor. 00:03:29
Once they hit the cool atmosphere, which is our plastic wrap, you can see the molecules 00:03:32
condense on the underside of the wrap into drops of liquid water. 00:03:36
Once there's enough condensation, water droplets will fall back into the bowl. 00:03:39
It's raining! 00:03:44
You've just created a tiny adorable water cycle all on your own. 00:03:45
Let's cycle back and review what we've learned. 00:03:53
Energy from the sun powers the water cycle, a process that moves water around the globe 00:03:55
through evaporation as the water rises, condensation as it forms into clouds, and precipitation 00:03:59
as it falls back down in the form of rain, snow, sleet, or hail. 00:04:05
Water moves through the system over and over again, changing forms and visiting every corner 00:04:09
of the Earth. 00:04:13
I bet you've got a whole new respect for this glass of water, huh? 00:04:14
Subido por:
Alicia M.
Licencia:
Dominio público
Visualizaciones:
107
Fecha:
14 de abril de 2022 - 16:24
Visibilidad:
Público
Centro:
IES LA SENDA
Duración:
04′ 28″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
119.43 MBytes

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