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  • Our planet is an amazing placebut there are parts of it that no one has ever seen!

  • Like where?

  • Like in the middle!

  • No one has ever been to the center of the Earth, not even close!

  • The deepest hole that's ever been dug didn't even make it through the thinnest, outer layer

  • of Earth's four amazing layers.

  • But even if you could go deeper than that, you'd have a really hard time digging!

  • Because those inner layers of the Earth get really hot!

  • So today, we're going to get as close as we can to seeing the center of the Earth,

  • by building a model of our planet!

  • First, let's go through what we know about Earth's four main layers.

  • The first layer is the one you're on right now!

  • It's called the crust.

  • The crust is the outermost layer of our planet, and it includes all of the land you can see

  • as well as the land that you can't see, like the very bottom of the ocean.

  • The crust is also the thinnest of Earth's layers.

  • But even so, we've never been able to dig all the way through it!

  • The crust is nice and cool on the outside, but once you dig down a kilometer or so, it

  • starts to get really warm really fast.

  • And the deeper you go, the hotter it gets!

  • By the time you reach the bottom of the crust, it's too hot for anything to live in!

  • Now, after the crust comes the second layer: the mantle.

  • It's the thickest of all of Earth's layers.

  • This layer is so hot that the rocks that make up the mantle are actually melted!

  • But we're not done yet!

  • The third layer is the outer core, and beneath that, at the very center of the Earth, is

  • the fourth layer, the inner core, the hottest of all the layers!

  • Now that we know each of the Earth's layers, we can make a model of our planet, from the

  • inside out!

  • All you'll need is a bunch of different colors of art clay.

  • You can use whatever colors you like.

  • But I'm going to use red, orange, yellow, brown, green, and blue.

  • Each layer in our model is going to have its own color, so we can tell them apart.

  • Now, what kind of temperature do you think of when you think of the color red?

  • I think hot!

  • So let's use red for the hottest layer, the inner core.

  • Orange doesn't seem as hot to me, but it does seem warmer than yellow, so we'll use

  • orange for the outer core.

  • Then let's use yellow for the mantle, and brown for the coolest layer, the crust.

  • But what about the green and blue?

  • We can use these colors to make the continents and the oceans, that is, the big masses of

  • land and water, they're parts of the crust, too.

  • Ok, so, let's start with our innermost layer, the inner core.

  • We'll take some red clay and roll it into a ball between our hands.

  • [Music Playing]

  • Once we have our inner core, let's take some orange clay and wrap that around the

  • red ball.

  • [Music Playing]

  • Our Earth is growing!

  • And the outer core is... almost done.

  • There!

  • Next, we'll put on a layer of yellow, which will be our mantle.

  • Do you remember what's special about this layer?

  • The mantle is the thickest of Earth's layers!

  • So let's add a little bit of extra yellow to make sure it's nice and thick.

  • [Music Playing]

  • This looks great!

  • Now we'll cover the mantle with brown, for our crust.

  • The crust is the thinnest layer, so we won't use as much clay for that.

  • [Music Playing]

  • There we go!

  • We got the crust done!

  • But we still have the blue and green left over to make continents and oceans.

  • You can shape the continents to make them look like they do on your globe, or you can

  • make them look however you like.

  • It's your model after all!

  • [Music Playing]

  • This looks great!

  • But now that our model of Earth is done, we can't see the layers inside.

  • So let's ask a grown-up for help, because I have an idea!

  • Ask them to find a butterknife and very carefully cut your globe in half.

  • [Music Playing]

  • Ooooo! Look at that!

  • You can see all of the layers.

  • On the outside is the crust, second is the big yellow mantle, next is the outer core,

  • and finally the very middle is the inner core.

  • [Squeaks squeaking]

  • That's right Squeaks, it does look really cool!

  • But there are lots of other ways you can make your own Earth!

  • You can try making Earth's layers with colored construction paper.

  • Or if you want to take a more delicious route, you and a grown up can make a four-layered

  • cake, with each layer colored to represent a layer of the Earth!

  • Get creative and have fun!

  • Thank you for joining Squeaks and me to create the Earth from the inside out, and we'd

  • like to give a big thank you to Google Making Science for helping us make this episode!

  • Do you have a globe you want to share with us?

  • Or do you have more questions about Earth?

  • We'd love to hear from you!

  • Just grab a grown-up and leave us a comment down below, or send us an e-mail to kids@thescishow.com.

  • And we'll see you next time!

Our planet is an amazing placebut there are parts of it that no one has ever seen!

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B1 中級 美國腔

由内而外建造地球(Build Earth from the Inside Out! - #sciencegoals)

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    joey joey 發佈於 2021 年 05 月 10 日
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