Shadowing Practice: Why is it Hot Underground? - Learn English Speaking with Video
Les maken...
1
Way back in the Middle Ages,
2
miners began to notice that the deeper they dug into the Earth,
3
the toastier it got.
4
Who knows what they made of the heat,
5
but the physicist Lord Kelvin,
6
of temperature fame, naturally, had a theory.
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Earth started off hot, and has been cooling down ever since,
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like a baked potato pulled from the oven.
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What's more, Kelvin was confident this idea would allow him to calculate the age of our potato—I mean, planet.
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Imagine pulling two recently baked potatoes out of a freezer,
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one that's been in there for just a minute,
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the other for half an hour.
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The minute-old one would still feel like a hot potato,
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while the half-hour frozen spud would have cooled well below the skin.
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You'd have to poke all the way to the center to feel its residual warmth. And
16
so in principle,
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you can tell how long ago a potato was cooked just by feeling how warm it is right beneath its surface.
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Which is exactly what Kelvin did,
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except with the Earth and scientific rigor.
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He took temperature measurements from the mines,
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put them into his calculations,
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and he got 20 million years.
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Which is, of course, very, very wrong.
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Somehow, the hot temperatures just under Earth's skin made it seem to Kelvin
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that our planet was pretty much fresh out of its cosmic oven,
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when we now know that it's 4,500 million years old.
27
Calvin's error is usually attributed to the fact that he didn't know about radioactivity,
28
which creates a ton of heat in Earth's core and helps keep the planet warm.
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But heat from radioactive decay moves so slowly through solid rock that taking radioactivity into account only improves Calvin's estimate by,
30
well, pretty much nothing.
31
Calvin's real oversight was in thinking of the Earth like a baked potato,
32
a solid lump through which heat slowly diffuses.
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Earth's mantle, the thick layer between the crust and the core,
34
is mostly solid, but it isn't rigid.
35
In fact, the rock closest to the molten outer regions of the core gets so hot that it becomes slightly more pliable,
36
like warmed candle wax.
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And like the hot air above a candle,
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the warm rock rises in convection currents over millions of years,
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spreading heat more evenly throughout the planet.
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This stirring carries tremendous amounts of heat from the core to the crust,
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fueling volcanoes, maybe helping to drive plate tectonics,
42
and heating mine shafts to temperatures that make Earth seem like it's fresh out of the cosmic oven.
43
Even though it's not.
44
loud too.
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Woordenschat en spreektips bij deze les
Deze spreekles op niveau C1 is gebaseerd op de video “Why is it Hot Underground?”. Deze woorden komen het vaakst terug: heat, potato, Earth, hot, Kelvin. Deze video bevat 44 zinnen en 431 woorden om na te spreken. Het gesproken deel duurt 2:40. De spreker praat in een natuurlijk tempo van ongeveer 161 woorden per minuut, dicht bij een alledaags gesprek. Slechts 77% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
De 15 moeilijkste woorden uit de video, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| bake werkwoord | /beɪk/ | bakken |
| oven zelfstandig naamwoord | /ˈʌ.vn̩/ | oven |
| radioactivity zelfstandig naamwoord | /ˌreɪdɪəʊakˈtɪvɪti/ | radioactiviteit |
| cosmic bijvoeglijk naamwoord | /ˈkɑz.mɪk/ | kosmisch, ruim- |
| candle zelfstandig naamwoord | /ˈkæn.dəl/ | kaars |
| physicist zelfstandig naamwoord | /ˈfɪzɪsɪst/ | natuurkundige, fysicus |
| pliable bijvoeglijk naamwoord | /ˈplaɪəbəl/ | plooibaar |
| residual bijvoeglijk naamwoord | /ɹɪˈzɪd͡ʒ.u.əl/ | overgebleven, residuair |
| miner zelfstandig naamwoord | /ˈmaɪnə(ɹ)/ | mijnwerker, kompel |
| poke werkwoord | /poʊk/ | porren |
| mantle zelfstandig naamwoord | /ˈmæn.təl/ | gloeikous |
| freezer zelfstandig naamwoord | /ˈfɹizɚ/ | vriezer, diepvriezer |
| lump zelfstandig naamwoord | /lʌmp/ | brok, klont |
| radioactive bijvoeglijk naamwoord | /ˌɹeɪdioʊˈæktɪv/ | radioactief |
| rigid bijvoeglijk naamwoord | /ˈɹɪd͡ʒ.ɪd/ | stijf, stroef |
Phrasal verbs die je zult horen
| Woord | Uitspraak | Betekenis |
|---|---|---|
| cool down werkwoord | /kuːl ˈdaʊn/ | afkoelen, koelen |
Uitspraak om op te letten
De spreker gebruikt 3 samentrekkingen en verkorte vormen, zoals didn't, isn't, you'd. Spreek ze kort uit, zoals je ze hoort.
- De klanken “sh” en “zh”: convection /kənˈvɛkʃən/, calculation /ˌkælkjuˈleɪʃn̩/, shaft /ˈʃɑːft/, measurement /ˈmɛʒ.ə.mənt/
- Lange woorden — let op de klemtoon: radioactivity /ˌreɪdɪəʊakˈtɪvɪti/, residual /ɹɪˈzɪd͡ʒ.u.əl/, radioactive /ˌɹeɪdioʊˈæktɪv/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: diffuse /dɪˈfjuz/, radioactive /ˌɹeɪdioʊˈæktɪv/, rigid /ˈɹɪd͡ʒ.ɪd/
- /æ/ — opener dan de Nederlandse “e”: candle /ˈkæn.dəl/, mantle /ˈmæn.təl/, radioactive /ˌɹeɪdioʊˈæktɪv/, calculation /ˌkælkjuˈleɪʃn̩/, attribute /ˈæt.ɹɪˌbjut/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als bake, oven, radioactivity.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.