Shadowing Practice: The Biggest Eruptions That Changed Earth Forever - Learn English Speaking with Video
Creando lección...
1
The Earth is a gigantic ball of semi-molten rock with a heart of iron as hot as the surface of the Sun.
2
Titanic amounts of heat left over from its birth
3
and the radioactive decay of trillions of tons of radioactive elements find no escape but up.
4
Currents of rock spanning thousands of kilometers carry this energy to the surface.
5
Earth's crust is the only thing in their way.
6
It feels solid to us, but it's only a fragile barrier, an appleskin around a flaming behemoth.
7
True apocalypses can break through and unleash eruptions tens of times more powerful than all of our nuclear weapons combined,
8
subjecting the climate to centuries worth of change in a single year, while drowning continents in toxic ash and gases.
9
Supervolcanoes.
10
How big can they get?
11
And will they put an end to humanity?
12
Volcanoes There are many types of volcanoes from towering mountains to lava domes,
13
but they have two main sources The first is at the boundaries between tectonic plates the pieces of the crust
14
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.
15
This sounds slow, but on geological timescales, it is a titanic struggle over who gets to stay on the surface.
16
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.
17
The asthenosphere.
18
The temperature here is enough to melt rock into a liquid, but the insane pressures of all that mass keep it a superheated solid.
19
Tectonic plates are usually in contact with water for thousands of years and absorb some of it.
20
When they're submerged into the hot underworld, this water triggers chemical transformations that allow tiny portions to melt into magma.
21
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.
22
If enough magma accumulates, it becomes powerful enough to pierce through the crust, which we experience as volcanoes.
23
This happens under the winning plate, like a revenge attack by the loser before it's erased forever.
24
The second main source of volcanoes are thought to be mantle plumes.
25
These are columns of abnormally hot rock that rise all the way from the planet's core mantle boundary to the surface.
26
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.
27
Storms hundreds of millions of years old, made of rock circulating at a rate of a few millimeters per month.
28
They don't care about the motion of tectonic plates, so they can break the crust to create volcanoes in the middle of nowhere
29
that stubbornly stay active as the crust shifts around them.
30
The volcanic boom meter.
31
Scientists love to put big booms on a scale
32
and came up with a logarithmic scale that measures the volume ejected during an eruption.
33
The volcanic explosivity index or VEI.
34
Simply put, it starts really small and gets very big very quickly.
35
A VEI-2 eruption would fill 400 full Olympic swimming pools with lava.
36
We have around 10 of these per year.
37
At VEI-3, we already see devastating effects, like the eruption of the Semeru volcano in 2021 that destroyed thousands of homes in Indonesia.
38
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.
39
Like the 2022 Hunga Tonga Hunga Hapai eruption that sent a shockwave around the globe many times and created ocean-wide tsunamis.
40
At a VEI of 6, an eruption can change the world.
41
In 1883, the Indonesian island volcano Krakatoa erupted nearly continuously over the course of five months.
42
One of those eruptions blew it apart, producing the loudest sound recorded in history.
43
Ten trillion times louder than a rocket taking off heard halfway around the world.
44
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.
45
Red, dusty sunsets followed for many years.
46
At VEI-7, we get super-colossal eruptions, millennium-defining events that human civilization has only encountered a handful of times.
47
Mount Tambora was a 4,300-meter-high mountain until it exploded in 1815 and released 400 times more energy than the Tsar Bomba.
48
140 billion tons of ash and dust were shot halfway to space before smothering the world's skies, turning them a sickly yellow.
49
There was no summer the following year, crops died and over 100,000 people perished.
50
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.
51
Okay, but what's a supervolcano?
52
The term supervolcano is a media invention and not a scientific term.
53
The main issue with them is that not every eruption from a supervolcano is a super eruption.
54
What makes supervolcanoes special is that they've been waiting to erupt for hundreds of thousands of years.
55
Pressure builds up in colossal magma reservoirs several kilometers deep until
56
it becomes strong enough to lift the rock above it by several meters.
57
Rocks crack under the pressure until they finally give way
58
and billions of tons of gas and ash blast out at supersonic speed.
59
An insane explosion of at least a thousand cubic kilometers that impacts every corner of the globe.
60
And yet, that is only a small portion of the magma reservoir.
61
Super-eruptions are like a boiling pot of water popping its lid off and spitting a bit off the top.
62
Afterwards, the ground collapses into the void left behind, forming a hole called a caldera caldera.
63
Under this caldera, pressure starts building again until the volcano gathers enough energy for another supereruption.
64
But this could take hundreds of thousands of years.
65
It's estimated
66
that one of the few volcanoes capable of supereruptions on Earth could cause a catastrophic eruption every 17,000 years on average.
67
That would make them far more frequent than comparable asteroid impacts.
68
The most recent supereruption is the Oranui eruption 26,500 years ago in New Zealand.
69
With the force of dozens of billions of tons of TNT, a Mount Everest-sized pile of explosives,
70
a huge portion of the landscape was scooped out and thrown into the atmosphere.
71
It left behind a caldera spanning 20 kilometers, and it caused the entire southern hemisphere to undergo a period of abrupt cooling.
72
Though among supereruptions, it's a mere firework.
73
The Lake Toba eruption of 74,000 years ago was a much more significant turning point in history.
74
It released a gargantuan 5,300 cubic kilometers of material, enough to blanket parts of South Asia in 15 centimeters of ash
75
and trigger a rapid 4 degrees Celsius drop in global temperatures.
76
It's possible that the volcanic winter lasted 10 years, followed by worldwide droughts for centuries.
77
Earth's climate might have not recovered for a thousand years.
78
The largest volcanic events we know of were not really huge explosions, but floods of millions of cubic kilometers of lava.
79
The grand finale were the Siberian traps around 250 million years ago, a continuous release of lava for 2 million years.
80
They raised the ocean temperatures to over 40 degrees Celsius, which caused the Permian-Triassic extinction, killing over 90% of all species.
81
Earth's surface needed 9 million years to recover.
82
These sorts of eruptions don't change the climate, they are the climate.
83
But thankfully, we haven't seen anything even remotely close to that scale in many millions of years.
84
So, should you be scared of supervolcanoes?
85
Definitely not.
86
They have been used to frighten many people and are overhyped as an unavoidable apocalypse.
87
The most famous one, Yellowstone, will erupt again, but they will be relatively small eruptions.
88
Natural disasters for sure, but not enough to devastate the US or come close to ending humanity.
89
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.
90
However, less powerful but more frequent eruptions can also do serious damage to our civilizations
91
and are in many ways a much greater concern.
92
So we must watch for slow changes in magma reservoirs like ground swelling
93
and temperature increases to get an early warning that can save the lives of people living the closest to a volcano.
94
And there's time to develop solutions that can remove sulfur and ash from the stratosphere
95
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
96
into an agent for good by exploiting the geothermal energy held in their giant magma reservoirs.
97
We've done this work for so many other disasters, and we are already doing things we could only have dreamed about decades ago,
98
like sending a probe to perform our first asteroid redirection test.
99
With determination, humanity really can solve anything.
100
So while deep below us an angry hell is churning and waiting for its moment, you can sleep well tonight.
📺 Mismo canal
C118
Your Skeleton Is Electric
IELTS PrepTOEFL PrepUniversity Students
C1113
Could Humans Evolve Flight?
IELTS PrepTOEFL PrepUniversity Students
C1132
Can Earth Run Out of Water?
IELTS PrepTOEFL PrepUniversity Students
C132
Your Brain Peaked at Birth
University StudentsWorking Adults
C132
Why Ebola Keeps Coming Back
University StudentsWorking Adults
C1554
What If You Never Slept?
IELTS PrepTOEFL PrepUniversity Students
C17
3 Reasons Why Nuclear Energy Is Terrible! 2/3
IELTS PrepTOEFL PrepUniversity Students
B28
Would You Upload Your Mind?
IELTS PrepTOEFL PrepUniversity Students
C11
Your Brain on Magic Mushrooms
IELTS PrepTOEFL PrepUniversity Students
C164
What the Flu Does to Your Body
IELTS PrepTOEFL PrepUniversity Students
C12
Is War Over? — A Paradox Explained
IELTS PrepTOEFL PrepUniversity Students
C15
How ADHD Medication Works
Daily ConversationUniversity StudentsWorking Adults
C11
The Most Complex Language in the World
IELTS PrepTOEFL PrepUniversity Students
B25
Let’s Steal a New Moon
IELTS PrepTOEFL PrepUniversity Students
C1758
How Stress Changes Your Brain
IELTS PrepTOEFL PrepUniversity Students
C13
What Happens AFTER Nuclear War?
IELTS PrepTOEFL PrepUniversity Students
C11
3 Reasons Why Nuclear Energy Is Awesome! 3/3
IELTS PrepTOEFL PrepUniversity Students
B252
Can We Stop the Extinction?
University StudentsWorking Adults
B26
YOU Own the Moon. And Mars. And Venus.
IELTS PrepTOEFL PrepUniversity Students
C1209
The True Cost of War
IELTS PrepTOEFL PrepUniversity Students
✨ Recomendar Video
C13
37 oraciones
The Megatsunami That Struck the Entire Planet
IELTS PrepTOEFL PrepUniversity Students
C12
120 oraciones
What is Plate Tectonics: Crash Course Geology #10
IELTS PrepTOEFL PrepUniversity Students
B26
51 oraciones
RE3 Unit 4A
IELTS PrepTOEFL PrepUniversity Students
C11
114 oraciones
There's a Giant Hole In Earth's History
IELTS PrepTOEFL PrepUniversity Students
B215
37 oraciones
Climate Change: How does it really work? | ClimateScience #1
IELTS PrepTOEFL PrepUniversity Students
C12
26 oraciones
Unit 2: Earthquake - Nguyễn Hằng My 32
IELTS PrepTOEFL PrepUniversity Students
C12
139 oraciones
Believers, is this a prophecy unfolding?
IELTS PrepTOEFL PrepUniversity Students
C12
220 oraciones
Venezuela's "Islands In The Sky", Explained.
IELTS PrepTOEFL PrepUniversity Students
C12
175 oraciones
What NASA Found on Io
IELTS PrepTOEFL PrepUniversity Students
C15
28 oraciones
How to Blow Up the Earth - Nuclear Engineer Reacts to Zack D. Films
IELTS PrepTOEFL PrepUniversity Students
Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel C1 se basa en el vídeo “The Biggest Eruptions That Changed Earth Forever”. Las palabras que más se repiten: eruption, rock, magma, Vei, kilometers. Este vídeo tiene 100 frases y 1525 palabras para practicar shadowing. La parte hablada dura 9:55. El hablante habla a un ritmo natural de unas 154 palabras por minuto, cercano a una conversación cotidiana. Solo el 72 % de las palabras está entre las 3.000 más comunes del inglés, por lo que el vocabulario es exigente.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| eruption sustantivo | /ɪˈɹʌpʃən/ | erupción |
| volcano sustantivo | /vɑlˈkeɪ.noʊ/ | volcán |
| magma sustantivo | /ˈmæɡ.mə/ | magma |
| crust sustantivo | /kɹʌst/ | repulgue, repulgo |
| volcanic adjetivo | /vɔlˈkænɪk/ | volcánico |
| reservoir sustantivo | /ˈɹɛz.ə(ɹ).vwɑɹ/ | embalse, pantano |
| caldera sustantivo | /kælˈdɛɹ.ə/ | caldera |
| tectonic adjetivo | tectónico | |
| mantle sustantivo | /ˈmæn.təl/ | manto, pendil |
| cubic adjetivo | /ˈkju.bɪk/ | cúbico |
| lava sustantivo | /ˈlɑvə/ | lava |
| melt verbo | /mɛlt/ | derretirse, fundirse |
| erupt verbo | /ɪˈɹʌpt/ | entrar en erupción, erupcionar |
| metre sustantivo | /ˈmiːtəɹ/ | metro |
| accumulate verbo | /əˈkjuːmjʊˌleɪt/ | acumular |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| come up with verbo | ingeniar, ingeniarse |
| sweep away verbo | arramblar |
| take off verbo | quitarse |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | is shoved · are thought · is known |
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | has only encountered · haven't seen · have been |
Pronunciación a tener en cuenta
El hablante usa 9 contracciones y formas reducidas, como don't, we've, haven't. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “th”: asthenosphere /asˈθɛnə(ʊ)sfɪə/, behemoth /bəˈhi(ː).məθ/, logarithmic /ˌlɒɡəˈɹɪðmɪk/, underneath /ˌʌndɚˈniθ/
- Los sonidos de “sh” y “zh”: eruption /ɪˈɹʌpʃən/, supereruption /ˌsuːpəɹɨˈɹʌpʃn̩/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, perish /ˈpɛɹɪʃ/, redirection /ɹiːdəˈɹɛkʃən/
- Palabras largas — cuida el acento: accumulate /əˈkjuːmjʊˌleɪt/, catastrophic /ˌkætəˈstɹɑfɪk/, apocalypse /əˈpɑkəlɪps/, radioactive /ˌɹeɪdioʊˈæktɪv/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: span /spæn/, sponge /spʌnd͡ʒ/, swell /swɛl/, scoop /skup/, sweep /swiːp/
- /v/ — no es /b/: los dientes tocan el labio inferior: volcano /vɑlˈkeɪ.noʊ/, volcanic /vɔlˈkænɪk/, reservoir /ˈɹɛz.ə(ɹ).vwɑɹ/, lava /ˈlɑvə/, devastate /ˈdɛv.ə.steɪt/
- /z/ — sonora, no /s/: reservoir /ˈɹɛz.ə(ɹ).vwɑɹ/, loser /luzɚ/, civilization /ˌsɪv.ɪ.laɪˈzeɪ.ʃən/, puzzle /ˈpʌzəl/, columns /ˈkɑləmz/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como eruption, volcano, magma.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.