Pratique du Shadowing: Earthquakes 101 | National Geographic - Apprendre l'anglais à l'oral avec YouTube

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From above, the planet appears eerily still.
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From above, the planet appears eerily still.
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But every mountain range and every chasm on its face is a scar,
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with many telling a story of when the Earth rumbled to life.
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Earthquakes occur around the world.
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They've been recorded on all seven continents,
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but most quakes take place in just three regions.
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The Mid-Atlantic Ridge, an underwater line that runs down the Atlantic Ocean,
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the Alpine Belt, which stretches from the Mediterranean to Southeast Asia,
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and the Circumpacific Belt, which traces along the edges of the Pacific Ocean and is where about 80% of all earthquakes occur.
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These areas experience the most earthquakes due to what lies beneath the surface.
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Earthquakes are the result of pressure,
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specifically pressure caused by extreme stress in the Earth's crust.
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That stress can be caused by volcanic activity or even man-made activities in certain areas.
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However, most earthquake-inducing stress is caused by the movement of tectonic plates.
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Tectonic plates are constantly moving,
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either against, away, along, or underneath each other.
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But sometimes, their edges may catch and stick.
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The plates, however, continue to move,
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or at least attempt to.
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Energy from this attempted movement builds around the edge's sticking point,
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creating immense pressure until the edges are forced to let go and the plates slip.
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This causes a sudden and powerful release of energy,
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so powerful that it breaks the Earth's crust.
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This fracturing emits shockwaves through the ground and causes intense vibrations or quakes.
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In fact, the world's most earthquake-prone regions are where the most geologically active plates meet.
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Earthquakes, or any seismic activity, are recorded by seismographs.
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When the ground shakes, seismographs oscillate,
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drawing a jagged line to reflect this movement.
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The more extreme the earthquake,
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the greater the height of the jagged line.
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These recorded motions are then used to measure the earthquake's strength, or magnitude.
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While several scales of magnitude exist,
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the one seismologists prefer is the moment magnitude scale.
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It has no upper limit,
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and it measures earthquakes logarithmically.
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This means that each magnitude on its scale is 10 times greater than the one before it.
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Unlike the now rarely used Richter scale,
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the Moment Magnitude Scale can be applied globally and can measure quakes of the highest magnitudes.
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The largest recorded earthquake occurred near Valdivia, Chile in 1960.
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Nestled within the circum-Pacific belt,
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the Valdivia earthquake was the most powerful in a series of quakes that struck the region,
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measuring at a magnitude of about 9.5.
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In addition to causing devastating tremors on land,
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the earthquake also generated a deadly tsunami reaching up to 80 feet high.
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The tsunami raced across the Pacific Ocean,
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hitting faraway countries like the Philippines and Japan.
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In fact, data from seismographs show that the shockwaves emitted by the Valdivia earthquake continued to shake the entire planet for days.
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Some earthquake-prone areas have adapted various ways to protect their communities.
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and bridges are designed to sway rather than break when an earthquake occurs.
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The public is educated on how to protect themselves during a seismic event,
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and government officials enact drills to ensure the protection of their people.
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Earthquakes can leave behind incredible devastation.
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But these same forces have also created magnificent features,
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with each adding character to a planet so unique.

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About This Lesson

In this lesson, you will practice your English listening and speaking skills by exploring the topic of earthquakes, as discussed in a captivating National Geographic video. You'll learn about the mechanics of earthquakes, their causes, and the regions most affected. By using the shadowing technique, you will improve your English pronunciation and comprehension through repetition and mimicking natural speech patterns. This activity will enhance your ability to discuss scientific topics confidently, assisting you in your journey to excel in IELTS speaking practice.

Key Vocabulary & Phrases

  • Earthquakes - Sudden shaking of the ground caused by stress release in the Earth’s crust.
  • Tectonic plates - Huge pieces of the Earth's crust that move and interact with each other.
  • Magnitude - A measure of the strength of an earthquake.
  • Seismographs - Instruments that record the motion of the ground during seismic activity.
  • Shockwaves - Waves of energy released during an earthquake, causing the ground to vibrate.
  • Circum-Pacific Belt - A major earthquake-prone region surrounding the Pacific Ocean.
  • Moment Magnitude Scale - A logarithmic scale used to measure the magnitude of earthquakes globally.
  • Tsunami - A large wave caused by seismic activity, often resulting from earthquakes under the ocean.

Practice Tips

To make the most of this lesson, utilize the shadowing technique. Start by watching the video slowly, paying close attention to how the speakers articulate each word. Repeat sentences or phrases shortly after hearing them while mimicking the tone and rhythm. This will help you improve English pronunciation significantly. You can replay segments that are particularly challenging to grasp the nuances of the language used. Given the informative and explanatory nature of the video, focus on intonation and stress during key phrases related to seismic events. For those preparing for the IELTS speaking practice, discussing the consequences of earthquakes and safety measures can provide you with valuable talking points. Remember, practice consistently, and don’t hesitate to use other educational videos to continue learning English with YouTube. The more you practice, the more fluent you will become!

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.

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