Prática de Shadowing: The Biggest Eruptions That Changed Earth Forever - Aprenda a falar inglês com vídeo

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The Earth is a gigantic ball of semi-molten rock with a heart of iron as hot as the surface of the Sun.
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Titanic amounts of heat left over from its birth
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and the radioactive decay of trillions of tons of radioactive elements find no escape but up.
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Currents of rock spanning thousands of kilometers carry this energy to the surface.
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Earth's crust is the only thing in their way.
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It feels solid to us, but it's only a fragile barrier, an appleskin around a flaming behemoth.
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True apocalypses can break through and unleash eruptions tens of times more powerful than all of our nuclear weapons combined,
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subjecting the climate to centuries worth of change in a single year, while drowning continents in toxic ash and gases.
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Supervolcanoes.
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How big can they get?
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And will they put an end to humanity?
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Volcanoes There are many types of volcanoes from towering mountains to lava domes,
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but they have two main sources The first is at the boundaries between tectonic plates the pieces of the crust
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that cover the earth like a giant jigsaw puzzle There are seven major tectonic plates and dozens of smaller ones, drifting against each other at up to 15 centimeters per year.
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This sounds slow, but on geological timescales, it is a titanic struggle over who gets to stay on the surface.
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The winning plate crumples into a new mountain range, while the loser is shoved underneath into an ocean of hot rock at 1,300 degrees Celsius.
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The asthenosphere.
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The temperature here is enough to melt rock into a liquid, but the insane pressures of all that mass keep it a superheated solid.
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Tectonic plates are usually in contact with water for thousands of years and absorb some of it.
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When they're submerged into the hot underworld, this water triggers chemical transformations that allow tiny portions to melt into magma.
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Liquid magma is less dense than solid rock, so it rises to the surface in furious bubbles that accumulate in sponge-like reservoirs right under the crust.
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If enough magma accumulates, it becomes powerful enough to pierce through the crust, which we experience as volcanoes.
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This happens under the winning plate, like a revenge attack by the loser before it's erased forever.
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The second main source of volcanoes are thought to be mantle plumes.
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These are columns of abnormally hot rock that rise all the way from the planet's core mantle boundary to the surface.
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Much less is known about them, but in a way, it's as if the Earth's mantle has weather patterns and mantle plumes are a little like hot air, rising to form storm clouds.
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Storms hundreds of millions of years old, made of rock circulating at a rate of a few millimeters per month.
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They don't care about the motion of tectonic plates, so they can break the crust to create volcanoes in the middle of nowhere
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that stubbornly stay active as the crust shifts around them.
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The volcanic boom meter.
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Scientists love to put big booms on a scale
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and came up with a logarithmic scale that measures the volume ejected during an eruption.
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The volcanic explosivity index or VEI.
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Simply put, it starts really small and gets very big very quickly.
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A VEI-2 eruption would fill 400 full Olympic swimming pools with lava.
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We have around 10 of these per year.
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At VEI-3, we already see devastating effects, like the eruption of the Semeru volcano in 2021 that destroyed thousands of homes in Indonesia.
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At VEI 5, we see catastrophic amounts of materials, cubic kilometers of debris, equivalent to an entire lake of molten rock blasted into the air.
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Like the 2022 Hunga Tonga Hunga Hapai eruption that sent a shockwave around the globe many times and created ocean-wide tsunamis.
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At a VEI of 6, an eruption can change the world.
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In 1883, the Indonesian island volcano Krakatoa erupted nearly continuously over the course of five months.
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One of those eruptions blew it apart, producing the loudest sound recorded in history.
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Ten trillion times louder than a rocket taking off heard halfway around the world.
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Thirty-meter-high tsunamis swept away nearby populations, and so much gas and ash were released that global temperatures cooled by nearly 0.5 degrees Celsius.
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Red, dusty sunsets followed for many years.
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At VEI-7, we get super-colossal eruptions, millennium-defining events that human civilization has only encountered a handful of times.
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Mount Tambora was a 4,300-meter-high mountain until it exploded in 1815 and released 400 times more energy than the Tsar Bomba.
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140 billion tons of ash and dust were shot halfway to space before smothering the world's skies, turning them a sickly yellow.
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There was no summer the following year, crops died and over 100,000 people perished.
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This is the dreadful potential of volcanic eruptions, with famines across the other side of the world and even centuries-long cold periods being attributed to them.
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Okay, but what's a supervolcano?
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The term supervolcano is a media invention and not a scientific term.
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The main issue with them is that not every eruption from a supervolcano is a super eruption.
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What makes supervolcanoes special is that they've been waiting to erupt for hundreds of thousands of years.
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Pressure builds up in colossal magma reservoirs several kilometers deep until
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it becomes strong enough to lift the rock above it by several meters.
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Rocks crack under the pressure until they finally give way
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and billions of tons of gas and ash blast out at supersonic speed.
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An insane explosion of at least a thousand cubic kilometers that impacts every corner of the globe.
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And yet, that is only a small portion of the magma reservoir.
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Super-eruptions are like a boiling pot of water popping its lid off and spitting a bit off the top.
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Afterwards, the ground collapses into the void left behind, forming a hole called a caldera caldera.
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Under this caldera, pressure starts building again until the volcano gathers enough energy for another supereruption.
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But this could take hundreds of thousands of years.
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It's estimated
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that one of the few volcanoes capable of supereruptions on Earth could cause a catastrophic eruption every 17,000 years on average.
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That would make them far more frequent than comparable asteroid impacts.
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The most recent supereruption is the Oranui eruption 26,500 years ago in New Zealand.
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With the force of dozens of billions of tons of TNT, a Mount Everest-sized pile of explosives,
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a huge portion of the landscape was scooped out and thrown into the atmosphere.
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It left behind a caldera spanning 20 kilometers, and it caused the entire southern hemisphere to undergo a period of abrupt cooling.
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Though among supereruptions, it's a mere firework.
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The Lake Toba eruption of 74,000 years ago was a much more significant turning point in history.
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It released a gargantuan 5,300 cubic kilometers of material, enough to blanket parts of South Asia in 15 centimeters of ash
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and trigger a rapid 4 degrees Celsius drop in global temperatures.
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It's possible that the volcanic winter lasted 10 years, followed by worldwide droughts for centuries.
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Earth's climate might have not recovered for a thousand years.
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The largest volcanic events we know of were not really huge explosions, but floods of millions of cubic kilometers of lava.
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The grand finale were the Siberian traps around 250 million years ago, a continuous release of lava for 2 million years.
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They raised the ocean temperatures to over 40 degrees Celsius, which caused the Permian-Triassic extinction, killing over 90% of all species.
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Earth's surface needed 9 million years to recover.
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These sorts of eruptions don't change the climate, they are the climate.
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But thankfully, we haven't seen anything even remotely close to that scale in many millions of years.
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So, should you be scared of supervolcanoes?
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Definitely not.
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They have been used to frighten many people and are overhyped as an unavoidable apocalypse.
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The most famous one, Yellowstone, will erupt again, but they will be relatively small eruptions.
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Natural disasters for sure, but not enough to devastate the US or come close to ending humanity.
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The chance of a VEI-8 eruption in the next few hundred years is less than 2%, and more importantly, it wouldn't come as a sudden surprise.
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However, less powerful but more frequent eruptions can also do serious damage to our civilizations
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and are in many ways a much greater concern.
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So we must watch for slow changes in magma reservoirs like ground swelling
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and temperature increases to get an early warning that can save the lives of people living the closest to a volcano.
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And there's time to develop solutions that can remove sulfur and ash from the stratosphere
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to eliminate the root cause of the climate disruption we've seen from previous eruptions. Who knows, maybe we'll even be able to turn this force of destruction
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into an agent for good by exploiting the geothermal energy held in their giant magma reservoirs.
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We've done this work for so many other disasters, and we are already doing things we could only have dreamed about decades ago,
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like sending a probe to perform our first asteroid redirection test.
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With determination, humanity really can solve anything.
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So while deep below us an angry hell is churning and waiting for its moment, you can sleep well tonight.

Contexto & Fundamentos

O vídeo "As Maiores Eruções que Mudaram a Terra para Sempre" explora os fenômenos vulcânicos e suas consequências devastadoras. Através de uma narrativa envolvente, o apresentador destaca a estrutura interna da Terra, os tipos de vulcões e como as erupções podem afetar o clima global e a civilização humana. Para os aprendizes de inglês, entender esse tema não só enriquece o vocabulário, mas também fornece um contexto fascinante para a prática de conversação em inglês.

As 5 Principais Frases para Comunicação Diária

  • “A Terra é um gigante...” – Esta frase captura a atenção e pode ser usada para iniciar conversas sobre geologia.
  • “Eruções vulcânicas podem mudar o clima.” – Útil para discutir mudanças climáticas e suas causas.
  • “Os vulcões estão localizados nas bordas das placas tectônicas.” – Uma boa informação sobre geografia que pode ser explorada em diálogos.
  • “O índice de explosividade vulcânica mede a força das erupções.” – Essa frase pode ser empregada em discussões técnicas e científicas.
  • “Eruções super-colossais mudaram a história da humanidade.” – Um ponto importante para incentivar debates sobre o impacto histórico dos desastres naturais.

Guia Passo a Passo para Shadowing

A técnica de shadowing, ou “sombra”, é uma ferramenta eficaz para melhorar a fluência e a pronúncia em inglês. Para este vídeo, siga estas etapas:

  1. Escute o vídeo: Preste atenção ao tom e à entonação do apresentador. Sempre que possível, utilize plataformas de shadowing site para acessar o conteúdo.
  2. Repita em voz alta: Após ouvir uma frase, pause o vídeo e tente repetir o que ouviu. Foque na pronúncia e no ritmo.
  3. Identifique palavras-chave: Anote palavras ou expressões que se destacam e que podem enriquecer seu vocabulário em contextos de prática de conversação em inglês.
  4. Transcreva trechos: Escreva algumas das frases que você achou mais impactantes. Isso ajuda na memorização e na compreensão.
  5. Pratique em diálogos: Use o que aprendeu em conversas com amigos ou em situações simuladas. Quanto mais você se expuser ao shadowing em inglês, mais confortável ficará.

Com a técnica de shadow speak, você pode não apenas aprimorar suas habilidades linguísticas, mas também explorar temas complexos que incitam o debate e a curiosidade sobre o nosso mundo.

O que é a Técnica de Shadowing?

Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.