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A GLASS OF DINOSAUR PEE - Contenido educativo

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Subido el 14 de abril de 2022 por Alicia M.

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Thirsty? 00:00:00
How about a nice cold glass of dinosaur pee? 00:00:01
Ah, so refreshing. 00:00:13
Let me explain. 00:00:26
Last time we learned all about the water cycle. 00:00:27
Water circulates around the Earth going from a liquid to a gas, 00:00:30
and occasionally to a solid, over and over again. 00:00:33
And while I was babbling on about the water cycle, you may have noticed something. 00:00:36
Water never leaves the system, and new water never comes in. 00:00:40
That makes water a limited resource. 00:00:44
resource. 00:00:46
There's only a certain amount of it on Earth, no more and no less, and that amount never 00:00:47
changes. 00:00:52
So, what does it mean when we say that water is a limited resource? 00:00:53
Remember that water is matter, and matter is made up of particles. 00:01:01
As we've learned, the particles can move around, changing states, buddying up with 00:01:06
other particle friends, but new particles can't be created from nothing, and they 00:01:09
can't be totally destroyed. 00:01:13
This is called the conservation of matter. 00:01:15
Since water keeps cycling over and over again on our planet without adding or removing matter, 00:01:18
we say it's a closed system. 00:01:23
Well, it's a mostly closed system. 00:01:25
Teensy amounts can leak out into space and whatnot. 00:01:27
But for our purposes, let's assume it's closed. 00:01:30
Now, if you were paying super close attention last time, you may have noticed that we only 00:01:33
talked about three of the Earth's four spheres. 00:01:37
We talked about how water, the hydrosphere, interacts with the geosphere in liquid form 00:01:40
and the atmosphere in vapor form. 00:01:45
Can you tell which one we missed? 00:01:47
You're looking at it. 00:01:48
Me. 00:01:49
And you. 00:01:50
And us. 00:01:51
We're both members of the biosphere. 00:01:52
That means me, and you, and my cat in this tree, and that triceratops that lived a long 00:01:54
time ago, were all part of the water cycle too. 00:01:58
And that leads to some pretty crazy ideas. 00:02:01
This is where science can get kind of...gross. 00:02:04
Let's look at the water cycle over time. 00:02:07
Hmm. 00:02:09
Water has been on the Earth almost as long as there has been an Earth. 00:02:13
Scientists aren't sure how it got here in the first place, but we know that it's here, 00:02:17
and it's not going anywhere. 00:02:21
That means the water coming out of your faucet is old. 00:02:22
Really old. 00:02:26
I'm talking older than dinosaurs old. 00:02:27
Take this thirsty brachiosaurus over here. 00:02:30
He stops at a stream for a long drink. 00:02:33
He moves about his day, doing dinosaur things, hanging out with his dinosaur friends, until 00:02:35
nature calls. 00:02:40
He's gotta go. 00:02:41
The brachiosaurus pea hits the ground, and pea is, well, mostly water. 00:02:42
The sun shines down and evaporates that water in the pea, turning it into water vapor, while 00:02:47
the salt and other minerals are left behind on the soil. 00:02:52
The water vapor rises into the atmosphere, mixes with other water vapor, and cools enough 00:02:55
to condense into a cloud. 00:03:00
Then the wind may move the cloud to a whole different part of the world. 00:03:02
Eventually, gravity will pull the water back to the ground as precipitation. 00:03:05
Keep in mind, the dinosaur pee, just like all matter, is made up of lots of particles. 00:03:10
As they move together through the water cycle, the particles that were all together in our 00:03:15
brachiosaurus pee get all mixed up with other water particles that have been on different 00:03:18
journeys. 00:03:23
But since the Earth only has a limited number of total water particles, these little guys 00:03:24
move through the water cycle again and again. 00:03:28
So some of the dinosaur pee water particles might have spent thousands of years locked 00:03:31
in glacier ice. 00:03:36
Some of them passed through many more dinosaurs. 00:03:37
Some flowed through the Nile River as the ancient Egyptians were building the pyramids. 00:03:40
Some hydrated a giant redwood tree. 00:03:44
Some quenched the thirst of George Washington. 00:03:47
And some of those particles eventually became, you guessed it, his pee. 00:03:50
You could be drinking George Washington's pee. 00:03:55
Or his sweat. 00:03:58
Or his tears. 00:03:59
The good news, though, is that as water moves through the cycle, nature cleans it. 00:04:00
The water cycle takes salty, undrinkable water from the ocean and turns it into the glorious 00:04:05
refreshing drinkable drink we all enjoy. 00:04:09
That's because when water is evaporated from the ocean, 00:04:12
or from a puddle of pee, 00:04:15
the salt and other impurities get left behind. 00:04:17
The particles in your drinking water would have some crazy stories to tell. 00:04:23
But one thing's for certain. 00:04:28
Since water is a limited resource in a closed system, 00:04:30
some of the particles definitely pass through a dinosaur. 00:04:33
Subido por:
Alicia M.
Licencia:
Dominio público
Visualizaciones:
147
Fecha:
14 de abril de 2022 - 17:05
Visibilidad:
Público
Centro:
IES LA SENDA
Duración:
04′ 48″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
128.02 MBytes

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