Dinosaur Pee?: Crash Course Kids #24.2 - By Crash Course Kids
Transcript
00:0-1 | mm thirsty . How about a nice cold glass of | |
00:04 | dinosaur P . Mhm . Yeah . Yeah . Uh | |
00:14 | So refreshing . Okay , let me explain last time | |
00:27 | we learned all about the water cycle , Water circulates | |
00:30 | around the earth , going from a liquid to a | |
00:32 | gas and occasionally to a solid over and over again | |
00:36 | . And while I was babbling on about the water | |
00:38 | cycle , you may have noticed something . Water never | |
00:41 | leaves the system and new water never comes in . | |
00:44 | That makes water a limited resource . There's only a | |
00:47 | certain amount of it on earth , no more and | |
00:49 | no less . And that amount never changes . So | |
00:53 | what does it mean when we say that water is | |
00:55 | a limited resource ? Remember that water is matter and | |
01:03 | matter is made up of particles . As we've learned | |
01:06 | the particles can move around changing states budding up with | |
01:09 | other particle friends . But new particles can be created | |
01:12 | from nothing and they can't be totally destroyed . This | |
01:15 | is called the conservation of matter . Since water keeps | |
01:18 | cycling over and over again on our planet without adding | |
01:21 | or removing matter . We say it's a closed system | |
01:24 | . Well , it's a mostly closed system teens . | |
01:27 | The amounts can leak out into space and whatnot . | |
01:29 | But for our purposes , let's assume it's closed . | |
01:33 | Now , if you're paying super close attention last time | |
01:35 | , you may have noticed that we only talked about | |
01:38 | three of the Earth's four spheres , we talked about | |
01:40 | how water , the hydra sphere interacts with the geo | |
01:43 | sphere in liquid form and the atmosphere in vapor form | |
01:46 | . Can you tell which one we missed ? You're | |
01:48 | looking at it . Me and you and us were | |
01:51 | both members of the biosphere . That means me and | |
01:54 | you and my cat industry and that triceratops that lived | |
01:57 | a long time ago . We're all part of the | |
02:00 | water cycle to and that leads to some pretty crazy | |
02:02 | ideas . This is where science could get kind of | |
02:05 | gross . Let's look at the water cycle over time | |
02:10 | . Mm water has been on the earth almost as | |
02:14 | long as there has been an Earth scientists aren't sure | |
02:17 | how it got here in the first place , but | |
02:19 | we know that it's here and it's not going anywhere | |
02:22 | . That means the water coming out of your faucet | |
02:24 | is old . Really old . I'm talking older than | |
02:28 | dinosaurs . Old . Take this thirsty brachiosaurus . Over | |
02:31 | here , he stops at a stream for a long | |
02:33 | drink . He moves about his day doing dinosaur things | |
02:37 | hanging out with his dinosaur friends until nature calls . | |
02:40 | He's got to go . The brachiosaurus P hits the | |
02:43 | ground and P is well , mostly water . The | |
02:46 | sun shines down and evaporates that water in the p | |
02:49 | turning it into water vapor . While the salt and | |
02:52 | other minerals are left behind on the soil , the | |
02:55 | water vapor rises into the atmosphere , mixes with other | |
02:58 | water vapor and cools enough to condense into a cloud | |
03:01 | . Then the wind may move the cloud to a | |
03:03 | whole different part of the world . Eventually , gravity | |
03:06 | will pull the water back to the ground as precipitation | |
03:09 | . Keep in mind the dinosaur P just like all | |
03:11 | matter , is made up of lots of particles as | |
03:14 | they move together through the water cycle . The particles | |
03:17 | that world together in our brachiosaurus P get all mixed | |
03:20 | up with other water particles that have been on different | |
03:22 | journeys . But since the earth only has a limited | |
03:25 | number of total water particles , these little guys move | |
03:28 | through the water cycle again and again . So some | |
03:31 | of the dinosaur pee . Water particles might have spent | |
03:34 | thousands of years locked in glacier ice . Some of | |
03:37 | them passed through many more dinosaurs . Some flowed through | |
03:40 | the Nile River as the ancient Egyptians were building the | |
03:43 | pyramids , some hydrated a giant redwood trees , some | |
03:46 | quench the thirst of George Washington , and some of | |
03:50 | those particles eventually became , you guessed it , his | |
03:53 | P you could be drinking George Washington's P . Or | |
03:57 | his sweat or his tears . The good news though | |
04:00 | , is that as water moves through the cycle , | |
04:02 | nature cleans it . The water cycle takes salty , | |
04:06 | undrinkable water from the ocean and turns it into the | |
04:08 | glorious , refreshing , drinkable drink we all enjoy . | |
04:12 | That's because when water is evaporated from the ocean or | |
04:15 | from a puddle of pee , the salt and other | |
04:17 | impurities get left behind . The particles in your drinking | |
04:24 | water would have some crazy stories to tell . But | |
04:28 | one thing's for certain . Since water is a limited | |
04:30 | resource in a closed system , some of the particles | |
04:34 | definitely passed through a dinosaur . |
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