Pratique du Shadowing: What is Plate Tectonics: Crash Course Geology #10 - Apprendre l'anglais à l'oral avec la vidéo
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120 phrases
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1
Almost.
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All the planets, earthquakes, and volcanic eruptions happen in one place: the Ring of Fire!
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No, really.
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That's what it's called.
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Dope, I know!
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Nearly the whole Pacific Ocean is bordered by this treacherous region.
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We're talking the sights of some of the biggest earthquakes ever recorded.
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Massive volcanoes in Indonesia, Russia, even Antarctica.
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Huge explosions and fractures that happened on land and underwater.
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you But why?
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What makes the Ring of Fire so...
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fiery.
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Hi, I'm Sage, and this is Crash Course Geology.
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The Ring of Fire came about thanks to a billions of years -long process, where all the continents, all the ocean floors,
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Everything that makes up Earth's outermost layer shifts around, pulling apart, crashing into each other, What's that, Dwayne?
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Oh yeah, that does sound like one of your family reunions.
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Let's break down how all that works.
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Earth has three main layers: crust, mantle, and core.
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Its rigid outer shell, called the lithosphere, is made up of the crust, and the uppermost part of the mantle.
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But the lithosphere isn't just one solid piece of Earth.
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It's broken up into plates: huge slabs of rock that are puzzle pieced together.
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They're generally composed of both continental lithosphere, which makes up the land we can see, and oceanic lithosphere, which makes up the seafloor.
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Continental lithosphere is made up of mostly thick, lightweight granite, while oceanic lithosphere is made of denser, heavier rocks like basalt and gabbro.
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Roughly 95 % of Earth's surface is made up of seven major plates, with the rest covered by much smaller ones.
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And underneath those plates is the asthenosphere, where intense heat from Earth's core warms up the mantle rock so much that they flow around and bend like taffy.
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convection currents, or heat -based flow cycles.
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And those currents power important forces that move Earth's plates and one big geologic slow dance called plate tectonics.
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Plate tectonics shapes our world, literally.
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And all the action happens where plates meet: at their edges, called plate boundaries.
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Like, at divergent boundaries, plates move away from each other.
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As oceanic plates diverge, the hot mantle rock wells upward and some erupts as lava, which cools and hardens into new oceanic crust.
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This process is called seafloor spreading, and it's mainly generated by ridge push, downward and pushes away the older crust.
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When continental plates diverge, the Earth's crust thins and breaks apart, creating features called rift valleys.
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We can see this happening in East Africa, where the Nubian and Somalian plates started pulling apart about 25 million years ago.
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Meanwhile, at convergent boundaries, plates move toward each other.
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When a dense oceanic plate meets a more buoyant continental plate, a process called subduction happens.
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The denser plate slides underneath the other one, returning that rock to the mantle.
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This is primarily thanks to slab pole, the gravitational force that yanks plates downward.
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And this is largely what happens in the Ring of Fire: it's full of subduction zones.
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As the oceanic plates slide deep underground, they release water into the hot rocks above, which has an explosive result.
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tons of volcanic activity.
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And if two dense oceanic plates meet at a convergent boundary, subduction can create huge depressions in the surface, like the Ring of Fire's Mariana Trench,
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which contains the deepest point in the world.
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It's on Dwayne's bucket list.
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Now, when two continental plates converge, watch out!
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Because instead of subducting, they'll smash into each other, forming massive mountain ranges like the Alps and the Himalayas.
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When continental plates converge with oceanic ones, the continental plate usually wins, staying on the surface as the denser stuff is forced down.
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But it's not always a competition.
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Sometimes, plates move past each other, at spots called transform boundaries.
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You can think of these plates like pieces of sandpaper.
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They don't easily slide past each other.
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Eventually that stress reaches a point where the ground moves with a jolt, aka an earthquake.
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The San Andreas Fault in California is a transform boundary that has had many earthquakes, like the Loma Prieta earthquake in 1989, which folks in my neck of the woods still talk about.
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But that kind of ground rattling can happen at all types of plate boundaries when there's enough stress.
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Plate movements have shaped what the Earth's surface looks like throughout our planet's history.
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In fact, at multiple times in Earth's past, the shifting tectonic plates have caused all the continents to collide and form one giant supercontinent,
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the most recent hundred million years ago.
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It's like seeing Earth in her awkward phase.
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So yeah, plate tectonics has been happening for a long time,
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keeping the Earth's surface in constant motion for something like three billion years.
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The continents move an average of about 1 .5 centimeters a year.
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That means that, in all of recorded human history, the ground below you has shifted probably about...
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76 meters.
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That's only about as wide as a professional soccer field.
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That creeping movement is way too slow to feel.
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So, How do we know it's actually happening?
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Way back in the 1910s, German geologist Alfred Wegener looked at a map of the world and noticed that the continents looked like they fit together, almost like puzzle pieces.
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And he built a theory to explain what he was seeing: continental drift.
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He believed that the continents were moving slowly around the Earth, together and apart, drifting through the crust like icebergs in the ocean.
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He's even credited with coming up with the name Pangaea, meaning "all of the Earth." But the geological community dunked on Wegener pretty hard.
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that the continents formed and moved vertically, not horizontally, driven by the heating and cooling of Earth's surface way back when it formed.
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But Wechner was on to something.
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And his idea laid a foundation that other geologists built on.
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Let's hang out with some of my geology rock stars!
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For a long time, we had no clue what the seafloor looked like.
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Most geologists thought it was just flat.
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In the 1950s and '60s, American geologist Marie Tharp and her collaborator Bruce Heazen used sonar to map it.
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Given the culture at the time, Bruce got to gather data aboard research ships, while Marie was forced to stay on land and make maps.
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'cause she was a lady.
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With pens, ink, and rulers as her tools, she and her colleague, Hester Herring, methodically plotted each data point.
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And what the team discovered was incredible.
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Not a flat, barren wasteland, but a 40 ,000 -mile underwater mountain range that circled the globe like a seam on a baseball.
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This was a major point in favor of plate tectonics theory.
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Over the course of several years, Tharp and Hiesen worked with Austrian artist Heinrich Barron to paint an accurate map of the entire seafloor.
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And in 1977, The World Ocean Floor Panorama was published.
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Twenty years later, Tharp was named one of the four greatest cartographers of the 20th century by the Library of Congress.
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In 1999, Tharp said that at the start, "I had a blank canvas to fill with extraordinary possibilities.
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And she did just that.
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It took decades and many lines of evidence for the theory of plate tectonics to develop and gain consensus.
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But the combined efforts of geologists across the world brought us to the conclusion that really does move underneath our feet.
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And that consensus didn't look like a bunch of geologists saying, "Eh, Sounds about right.
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Science historian Naomi Oreskes called it:
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"The first theory to ever be accepted in the entire history of Earth science." Can you imagine that level of harmony?
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It'd be like if every film critic agreed on the best movie ever made.
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Dwayne's favorite?
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Shrek 2.
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Today, we know that plate tectonics shape the planet we know and love.
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It's why Europe is warm enough for people to live there, while Antarctica is uninhabitable.
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Unless you count the penguins.
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Regardless, Knowing about plate tectonics helps us prepare our communities for disasters like volcanic eruptions, earthquakes, and tsunamis.
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And it gives us a window into Earth's past.
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Earth's plates are still moving.
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Right now!
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And we're still learning more about them.
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Like, We don't know exactly what our planet will look like in the distant future.
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Some predict that 250 million years from now, Earth may be home to another supercontinent, similar to good ol' Pangaea.
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And we don't know how long plate tectonics will last.
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One day, when the Earth gets old enough to cool way down inside, plate tectonics will come to a stop.
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reshaping the world in a big way one last time.
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That could look like mountains eroding into plateaus, Earth's magnetic field stripping away, and continents sinking into the ocean.
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But that's potentially billions of years away.
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Plate tectonics isn't going anywhere anytime soon, and neither is our massive, magnificent planet.
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Our planet moves us.
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And not just in the tear -jerking "Wow, Earth really is something" kind of way.
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The land beneath us is constantly shifting, creating something new every day, albeit very slowly.
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Go at your own pace, girl.
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As long as the sea floor keeps spreading and gravity keeps pulling, Earth's plates will be carrying us around, shaping and reshaping the world as we know it.
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Next time?
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We'll talk about how plate tectonics builds mountains.
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See you then!
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « What is Plate Tectonics: Crash Course Geology ». Les mots qui reviennent le plus souvent : plate, tectonic, Earth, oceanic, continental. Cette vidéo contient 120 phrases et 1550 mots à répéter en shadowing. La partie parlée dure 9:28. Le locuteur parle à un rythme naturel d’environ 164 mots par minute, proche d’une conversation courante. Seuls 76 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
Les 15 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| tectonics nom | tectonique | |
| oceanic adjectif | /ˌəʊʃiˈænɪk/ | océanique |
| continental adjectif | /ˌkɑntɪˈnɛntl̩/ | continental |
| continent nom | /ˈkɑntɪnənt/ | continent |
| geologist nom | /d͡ʒiˈɑːlədʒɪst/ | géologue |
| lithosphere nom | lithosphère | |
| mantle nom | /ˈmæn.təl/ | manteau |
| dense adjectif | /ˈdɛns/ | dense |
| seafloor nom | fond marin | |
| subduction nom | /səbˈdʌkʃən/ | subduction |
| volcanic adjectif | /vɔlˈkænɪk/ | volcanique |
| underneath adverbe | /ˌʌndɚˈniθ/ | dessous |
| converge verbe | /kənˈvɜːd͡ʒ/ | converger |
| convergent adjectif | /kənˈvɜː.d͡ʒənt/ | convergent |
| diverge verbe | /daɪˈvɜːd͡ʒ/ | diverger |
Les verbes à particule que vous entendrez
| Mot | Prononciation | Sens |
|---|---|---|
| make up verbe | /ˌmeɪk ˈʌp/ | constituer, composer |
| break down verbe | tomber en panne | |
| come up with verbe | inventer, imaginer | |
| warm up verbe | /ˌwɔː(ɹ)m ˈʌp/ | se réchauffer, se chauffer |
| watch out | attention |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | is bordered · is made · is called |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | has had · have shaped · have caused |
| Propositions relatives who / which + proposition — une précision sur une personne ou une chose | lithosphere, which makes · above, which has |
Prononciation à surveiller
Le locuteur utilise 13 contractions et formes réduites, comme don't, isn't, we're. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « th »: underneath /ˌʌndɚˈniθ/, asthenosphere /asˈθɛnə(ʊ)sfɪə/, methodically /mɪˈθɑdɪkəli/
- Les sons « sh » et « zh »: oceanic /ˌəʊʃiˈænɪk/, subduction /səbˈdʌkʃən/, reshape /ɹiːˈʃeɪ̯p/, eruption /ɪˈɹʌpʃən/, convection /kənˈvɛkʃən/
- Mots longs — placez bien l’accent: oceanic /ˌəʊʃiˈænɪk/, geologist /d͡ʒiˈɑːlədʒɪst/, geology /d͡ʒɪˈɒl.ə.d͡ʒɪ/, underwater /ʌndɚˈwɔtəɹ/, asthenosphere /asˈθɛnə(ʊ)sfɪə/
Les sons difficiles pour les francophones :
- /h/ — il se souffle, il n’est pas muet: uninhabitable /ˌʌnɪnˈhæbɪtəbəl/, harden /ˈhɑɹdn̩/, historian /hɪˈstɔɹi.ən/
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: geologist /d͡ʒiˈɑːlədʒɪst/, converge /kənˈvɜːd͡ʒ/, convergent /kənˈvɜː.d͡ʒənt/, diverge /daɪˈvɜːd͡ʒ/, geology /d͡ʒɪˈɒl.ə.d͡ʒɪ/
- /r/ anglais — langue recourbée, sans frotter la gorge: crust /kɹʌst/, reshape /ɹiːˈʃeɪ̯p/, eruption /ɪˈɹʌpʃən/, drift /dɹɪft/, underwater /ʌndɚˈwɔtəɹ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme tectonics, oceanic, continental.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.