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  • Hi guys! Squeaks and I are getting ready to go on a hike. And today we're going to explore

  • something big...and old...and beautiful.

  • Do you know what I'm talking about?

  • I'm talking about a mountain!

  • We love climbing mountains, hiking through the mountains, and even just looking at them.

  • That's an interesting question, Squeaks! How do mountains form?

  • Well, let's start with what are mountains made of.

  • Mountains are made of the same stuff that we're all standing on right now, the hard, rocky

  • layer of the Earth's surface, called the crust.

  • Sounds kind of tasty! And that makes it easy to remember: The crust is the crispy, crunchy,

  • rocky part of Earth.

  • The dirt, the rocks, and all of the land on the planet are parts of the crust. And it

  • covers the whole Earth, even the land that's underwater.

  • So Earth's crust is kind of like bread crust: it covers everything in the same way that bread

  • crust covers the whole loaf!

  • But unlike bread crust, the Earth's crust isn't all in one piece. It's broken up

  • into pieces, called plates.

  • Plates that cover Earth like

  • a giant jigsaw puzzle.

  • These plates are huge, and heavy, but they don't just sit there. In fact, they're

  • always moving!

  • They move very slowly, just a tiny bit at a time, about a few centimeters a year.

  • But over long periods of time, all of that moving around can add up to some big changes!

  • Sometimes, two of the plates in the Earth's crust will move toward each other, and when

  • they do, they start to press against one another.

  • But they have nowhere to go! So they'll just push and push against each other until….they

  • start to crumple!

  • Then, the rocks that make up the plates are pushed up and over each other. The more they

  • push together, the more the land rises, and after a while -- voila! -- you have a mountain!

  • And since the plates are so huge, when they push up against each other, they don't just

  • make one mountain, they can make a whole mountain RANGE!

  • Mountain ranges like the Alps in Europe, the Andes in South America, and Appalachians in

  • the United States were all made this way, by two plates of the Earth's crust slowly

  • crashing into each other!

  • But because the plates move so slowly, it takes a really, really long time for this

  • to happen. I'm talking millions and millions of years!

  • And you know what's even cooler?

  • Some mountains are still growing!

  • Mount Everest, the highest mountain on Earth, grows about four millimeters every year.

  • And you know why? It's because the two plates that make up the land in that part of the

  • world are still slowly smashing into each other.

  • That means that the mountain is just a teeny bit taller this year than it was last year!

  • That's pretty amazing!

  • So the plates of Earth's crust are always in motion, which means that a long, long time

  • ago, the mountains we see today weren't there at all!

  • And the Earth will look different in the future, too! But it will take a really, really long time.

  • So the next time you're walking around on a beautiful mountain, you'll know where

  • it came from!

  • Chances are, it was made when pieces of the Earth's crust crashed into each other, and

  • maybe they're still crashing!

  • All this talk about mountains has made me ready to get out there and explore! So, Squeaks and I are

  • gonna hit the trails!

  • But remember, if you have a question about anything you'd like to learn more about,

  • just let us know by getting help from a grown up, and leaving a comment below. Or send us

  • an email to And we'll see you next time!

Hi guys! Squeaks and I are getting ready to go on a hike. And today we're going to explore


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Where Do Mountains Come From? | Geology for Kids

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    joey joey に公開 2021 年 05 月 11 日