Dinosaur Pee?: Crash Course Kids #24.2 - Free Educational videos for Students in K-12 | Lumos Learning

Dinosaur Pee?: Crash Course Kids #24.2 - Free Educational videos for Students in k-12


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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