Rocks for Kids - Free Educational videos for Students in K-12

Rocks for Kids - By CrashCourse

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00:0-1	Can you guess what this video is about ? Yeah
00:02	, we got to give it away , didn't we
00:04	? That's right . We are learning about rocks in
00:06	this video . Rocks are all around us . You
00:11	see rocks all the time And some rocks are huge
00:15	. Like the rocks that make up this massive rock
00:18	formation . They're huge . But then sometimes rocks can
00:22	be really tiny , wee wee tiny little baby rocks
00:27	, Rocks are amazing and they're all around us .
00:31	All right . So what are rocks ? Well rocks
00:35	are solid chunks of one or more minerals . Rocks
00:40	are mineral chunks . There are solid chunks of one
00:44	or more minerals . Now most rocks are mixtures of
00:50	multiple minerals . Like these rocks other rocks are made
00:57	up of just one mineral . Like in this picture
01:00	this is a picture of chalk , chalk is a
01:04	type of rock made of a mineral called calcite .
01:09	The next time you play with chalk just think wow
01:13	this is made of calcite . These are like sticks
01:16	of calcite shock is a rock that's made of calcite
01:23	. So rocks are solid chunks of one or more
01:27	minerals and they are super fun to learn about .
01:30	That's why geologists are so cool , geologists are rock
01:35	experts . They study rocks as their job . Mhm
01:40	geologists disagree about how many different types of rocks there
01:44	are but we can all agree on this . There
01:47	are so many different types of rocks . To make
01:50	things more . Simple rocks are put into three categories
01:53	three major types of rock , sedimentary igneous and metamorphic
02:01	. Can you say those with us sedimentary igneous ?
02:06	Uh huh . And metamorphic . Yeah now this is
02:12	pretty interesting . The category that Iraq belongs to tells
02:16	us how that rock was made here . We'll show
02:21	you with our first category of rocks sedimentary rocks .
02:27	Mhm . All right . So what are sedimentary rocks
02:31	? Sedimentary rocks are rocks that are made up of
02:34	little particles . They're made up of little particles .
02:38	The particles are called sediment . Can you say that
02:43	with us ? Sediment ? Yeah sediment an example of
02:47	sediment is sand . Yeah sand is a type of
02:51	sediment . It's kind of cool . Sea shells are
02:55	an example of sediment as well . So there are
02:59	lots of different types of sediment . But they're particles
03:02	that could come from non living things like sand or
03:05	they could come from living things like sea shells .
03:08	That's fun . Sedimentary rocks are made up of little
03:12	particles called sediments and you can even tell that from
03:17	the name . Sedimentary sediment is in the name .
03:22	So if you forget just look at the name ,
03:25	sedimentary sediment is in the name . So the way
03:31	sedimentary rocks are formed is by sediments collecting at the
03:35	bottom of bodies of water like lakes and oceans .
03:39	The sediment is pushed down by the water and over
03:42	time the sediment starts to harden into rock . Water
03:47	is what really makes sedimentary rocks without the water ,
03:51	the sediments would never harden to become sedimentary rocks .
03:56	They need water . Just think in that water .
04:01	Right now sediments are getting pressed down and are hardening
04:05	to become rock . The molecules in the water helped
04:09	the sediment stick together . Kind of like cement .
04:13	That is how sedimentary rocks are made . Okay we
04:18	have two categories left . Let's learn about metamorphic rocks
04:24	. Next metamorphic rocks are made when a rock goes
04:29	through a lot of heat or pressure . Remember sedimentary
04:36	rocks need water to be formed . They need water
04:39	. Metamorphic rocks are different metamorphic rocks are rocks that
04:44	need heat or pressure to be formed . Here's a
04:49	simple way to remember that the word metamorphic has another
04:53	word inside of it . The word morph . That's
04:56	interesting . The word morph means to be changed .
05:00	So when you think of rocks that are changed by
05:04	heat or pressure think metamorphic metamorphic rocks morph they are
05:11	changed by heat or pressure . Metamorphic rocks are formed
05:19	below the earth's surface . That's cool . And here's
05:24	the thing . Okay they make up a lot of
05:27	the earth's crust which is the outer shell of the
05:31	earth . Much of the earth's crust is made of
05:33	metamorphic rocks . So we're not talking about this type
05:38	of crust . We're talking about the earth's crust .
05:41	Okay you can see that the earth's crossed the outer
05:46	shell of the earth is broken up into these things
05:48	that almost look like puzzle pieces . Scientists call these
05:53	plates . Here is a map of these plates .
05:57	Okay . And they have a really cool name .
05:59	Scientists call them tectonic plates . Can you say that
06:03	with us ? That's so cool . Tectonic plates ,
06:07	These huge plates move and push against each other and
06:11	there is a lot of heat and pressure there .
06:15	Oh that's why there are so many metamorphic rocks that
06:20	form in and around the earth's crust while mystery solved
06:26	. And this is cool . The heat and pressure
06:28	not only change what the rock looks like on the
06:30	outside , they change what the minerals themselves are like
06:34	. So the rock actually changes form . That means
06:39	the heat or pressure morph the old rock into a
06:43	new rock . A metamorphic rock . Now sometimes sedimentary
06:50	rocks get pushed into the earth and our around pressure
06:54	or heat . Then the sedimentary rock turns into a
06:58	metamorphic rock . It morphs or changes into a different
07:02	rock . It has become metamorphic . So heat or
07:08	pressure create metamorphic rocks and they usually form deep under
07:13	the surface of the earth in and around the earth's
07:16	crust . All right now we've come to our final
07:21	rock category . Igneous Mhm . This is really interesting
07:27	. Igneous rocks are formed when molten rock cools and
07:32	hardens . You might be wondering , what does molten
07:36	rock mean ? What is molten rock ? Well this
07:40	is molten rock , molten rock is liquid rock and
07:44	there's two forms of it inside of the earth .
07:47	Molten rock is called magma . That's right magma .
07:53	But when it comes out from inside the earth it
07:57	is called lava , lava is molten rock . To
08:01	lava is molten rock that is no longer inside of
08:05	the earth . So Igneous rocks are formed when molten
08:10	rock cools and that molten rock can be magma or
08:14	lava . Do you remember how metamorphic rocks are formed
08:19	from pressure or heat ? Well , Igneous rocks are
08:22	kind of the opposite aren't they ? Igneous rocks are
08:25	formed from molten rock cooling . Isn't that interesting metamorphic
08:30	rocks are formed from pressure or heat . And the
08:34	igneous rocks are formed during this cooling of molten rock
08:40	. Mhm . Sometimes metamorphic rocks are heated so much
08:46	they turn into molten rock . When this molten rock
08:50	cools , it becomes an igneous rock . That's pretty
08:54	cool . A common place for igneous rocks to form
08:58	is a volcano . The lava that erupts out of
09:01	a volcano cools but the magma below a volcano can
09:05	cool us well , forming igneous rocks . Remember rocks
09:11	are chunks of minerals , They are mineral chunks and
09:15	they are grouped into three different categories . The first
09:21	category was sedimentary sedimentary rocks are formed when particles called
09:26	sediments joined together . It is almost like they want
09:30	to be friends as they form a new rock .
09:33	The second category was metamorphic metamorphic rocks are formed from
09:38	heat or pressure . It is almost like when someone
09:41	gets angry their face actions or words can be changed
09:45	or morphed . Mm . Finally the third category was
09:50	Igneous Igneous rocks are formed when molten rock cools off
09:55	this molten rock can be either magma or lava .
09:58	Igneous rocks are like when someone was really angry but
10:02	decides to take deep breaths to start to cool off
10:06	. Igneous rocks are formed when molten rock chills out
10:10	. I'm we've talked a little bit about this ,
10:13	as we've learned about these types of rocks . But
10:15	rocks change . Scientists call it the rock cycle .
10:19	Igneous rocks can break apart into sediment and become sedimentary
10:24	rocks , sedimentary rocks can be pushed into the earth
10:28	and become metamorphic rock . And metamorphic rocks can turn
10:31	into liquid rock and cool into igneous rock . That's
10:36	amazing , isn't it ? That is called the Rock
10:39	cycle . Mm It's fun to learn about rocks .
10:43	Next time you find a rock , find out what
10:45	type it is and think about all that That rock
10:48	has gone through . Rocks aren't just chunks of minerals
10:52	. They tell a wonderful story about how the earth
10:56	works special , thanks to our patrons , who make
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