The Great Aqua Adventure: Crash Course Kids #24.1 - Free Educational videos for Students in K-12

The Great Aqua Adventure: Crash Course Kids #24.1 - By Crash Course Kids

Transcript


00:0-1	This is a glass of water and it's been on
00:02	a long , long trip . I'm serious . It
00:05	didn't pack any bags or take any selfies along the
00:07	way . But this water has been around the world
00:09	many , many times . Think I'm crazy . I'm
00:22	not this water is part of a long worldwide system
00:26	called the water cycle . The water cycle explains the
00:28	way water moves on above and below the earth and
00:31	it's huge . It includes every giant glacier and every
00:35	tiny little puddle . It includes the water at the
00:37	bottom of the ocean and the water in the clouds
00:39	in the sky . As you know , water is
00:41	matter and we've learned that matter can change states .
00:44	It can be a solid a liquid or a gas
00:47	for water . That means it can be ice ,
00:49	liquid water or water vapor and does all of this
00:52	water , which makes up the hydro sphere , winds
00:54	its way around the world . It interacts with the
00:57	other three spheres . It starts as many things do
01:00	with the sun . Hey buddy , the sun sends
01:07	its energy down to the earth . The surface of
01:09	the oceans and lakes are heated until some of the
01:11	liquid water turns into a gas water vapor . This
01:15	process is called evaporation . Have you ever dried off
01:18	in the hot sun after a dip in the pool
01:20	? If you have , you've experienced evaporation after the
01:23	water evaporates , the water vapor rises higher and higher
01:26	into the atmosphere as it goes up , it starts
01:28	to cool , which makes a lot of sense .
01:31	You've probably noticed that the tops of tall mountains are
01:33	cold and snowy sometimes even in the summer . So
01:36	as the water vapor rises , it eventually gets cooler
01:38	and starts to turn into liquid . This is called
01:41	condensation . All those little water molecules start sticking together
01:45	along with the particles of dust and other tiny bits
01:47	of stuff , turning into a mass of small drops
01:49	of condensed water that we call clouds . And when
01:52	it's all snuggled up in the clouds , water can
01:54	do some serious traveling because wind and other air currents
01:58	can push clouds over long distances . So the water
02:01	in the clouds above , you may have originally been
02:03	picked up over a far away ocean . Now ,
02:05	if enough water particles in a cloud stick together ,
02:08	then the water will fall out , and when it
02:10	does , it's called precipitation , it takes millions of
02:13	cloud droplets to produce just one raindrop . If the
02:16	clouds are cold enough , that can form other kinds
02:18	of precipitation to ice crystals can form in the clouds
02:22	, for example , growing bigger and heavier until they
02:24	fall in the form of snow , sleet or hail
02:27	. No matter what form it takes though . Once
02:29	the waterfalls , it can go in a couple of
02:31	different routes , some of the water will hit the
02:33	ground and run towards streams and rivers where it will
02:36	eventually joined the ocean . Some of it will soak
02:38	into the ground through tiny pores in the soil .
02:40	This water can collect and hang out underground for years
02:43	until it slowly moves into the sea or it can
02:46	be pumped up to be used as drinking water .
02:48	And some of that water that rain down will also
02:51	quickly be evaporated again . This whole process , evaporation
02:55	, condensation and precipitation is repeated over and over ,
02:59	moving water all around the world , empowering weather events
03:02	. We have the water cycle to thank for hurricanes
03:05	, blizzards and that rainstorm that caught me outside without
03:08	an umbrella the other day . But you can also
03:09	watch the water cycle happen in your own kitchen .
03:12	Let's investigate . First , pour hot water into a
03:19	clear bowl , then cover it with plastic wrap and
03:21	place a few ice cubes on top . In this
03:23	experiment , the hot water is water that has been
03:25	heated by the sun and the rap with the ice
03:27	cubes is the cool atmosphere molecules in the hot water
03:30	rise in the form of water vapor . Once they
03:32	hit the cool atmosphere , which is our plastic wrap
03:34	, you can see the molecules condense on the underside
03:37	of the rap into drops of liquid water . Once
03:39	there's enough condensation , water droplets will fall back into
03:42	the bowl , it's raining . You've just created a
03:45	tiny , adorable water cycle all on your own .
03:52	Let's cycle back and review what we've learned . Energy
03:54	from the sun powers the water cycle a process that
03:57	moves water around the globe through evaporation as the water
04:00	rises , condensation as it forms into clouds and precipitation
04:04	as it falls back down in the form of rain
04:06	, snow , sleet or hail , water moves through
04:09	the system over and over again , changing forms and
04:12	visiting every corner of the earth . I bet you've
04:14	got a whole new respect for this glass of water
04:16	, huh ?

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