Shadowing Practice: Where Did Earth's Water Come From? - Learn English Speaking with Video
Les maken...
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Unlike every other planet in our solar system, Earth's surface is 70 % liquid water, which while useful for life, is also kind of weird,
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because everything we know about how and when our planet formed says Earth's surface should be bone dry.
3
The story goes like this.
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Our solar system formed from the collapse of a large cloud of dust and gas.
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The dense blob of gas at the center ignited to form the sun, which as a young unstable star unleashed a fierce solar wind.
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And over time, this stream of charged particles pushed the remaining gas cloud farther and farther out, leaving only solid particles behind to clump together into rocks,
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planetesimals, and finally, the rocky planets of the inner solar system that we know today.
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And here's the problem.
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Water, in the form of ice, couldn't have been one of the solid particles that stuck around to form our planet, because the early inner solar system was far too hot for frozen water,
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and any water vapor would have been blasted away by the solar wind.
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So if Earth didn't start off with water, how did we end up with such splendid oceans?
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We know H2O wasn't manufactured here over the eons, because natural processes like combustion,
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breathing and photosynthesis create and destroy roughly equal amounts of water, and either way, the amounts in question are so minuscule that they can't account for the abundance of water on the planet.
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Since Earth's water was neither part of the original package nor manufactured here, it must have flown in from far away, on meteoroids or comets or other bodies originating in the outer solar system,
15
where they were far enough from the sun for frozen water to survive.
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The dirty ice balls we call comets are a logical candidate for the source of our water, but were ruled out when we discovered that they were far richer in heavy hydrogen than earth water.
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Heavy hydrogen has a neutron as well as a proton in its nucleus, and for every million hydrogen atoms in earth water, about 150 are heavy ones,
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while typical comet water has twice that many.
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These mismatched chemical signatures suggest that Earth's water couldn't have arrived on comets.
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It turns out that the most likely source for Earth's water is a type of meteorite called a carbonaceous chondrite.
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Chondrite is just the name given to the class of stony meteoroids that most commonly strike the Earth.
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But only the carbonaceous chondrites contain water, as well as lots of carbon if you couldn't tell from their name.
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They have water in them because they formed out beyond the sun's frost line, and what's more, their water has levels of heavy hydrogen similar to that of earth water,
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strongly suggesting that these earth crashers are the source of our ice caps, clouds, rivers, and oceans.
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And thus the water that turned our planet into a blue marble came, quite literally, out of the blue.
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Woordenschat en spreektips bij deze les
Deze spreekles op niveau B2 is gebaseerd op de video “Where Did Earth's Water Come From?”. Deze woorden komen het vaakst terug: solar, planet, earth, comet, hydrogen. Deze video bevat 25 zinnen en 496 woorden om na te spreken. Het gesproken deel duurt 2:24. De spreker praat snel, ongeveer 206 woorden per minuut, dus reken op verbonden en ingeslikte klanken. Slechts 80% 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 |
|---|---|---|
| comet zelfstandig naamwoord | /ˈkɒmɪt/ | komeet, staartster |
| hydrogen zelfstandig naamwoord | /ˈhaɪdɹəd͡ʒ(ə)n/ | waterstof |
| chondrite zelfstandig naamwoord | /ˈkɒndɹaɪt/ | chondriet |
| particle zelfstandig naamwoord | /ˈpɑɹtək(ə)l/ | deeltje, partikel |
| freeze werkwoord | /ˈfɹiːz/ | bevriezen |
| ignite werkwoord | /ɪɡˈnaɪt/ | aansteken, ontsteken |
| meteorite zelfstandig naamwoord | /ˈmi.ti.əˌɹaɪt/ | meteoriet |
| minuscule zelfstandig naamwoord | /ˈmɪnəˌskjul/ | minuskel, kleine letter |
| neutron zelfstandig naamwoord | /ˈnu.tɹɑn/ | neutron |
| originate werkwoord | /əˈɹɪd͡ʒɪneɪt/ | voortkomen |
| photosynthesis zelfstandig naamwoord | /ˌfoʊ.toʊˈsɪn.θə.sɪs/ | fotosynthese |
| proton zelfstandig naamwoord | /ˈpɹoʊ.tɑn/ | proton |
| unleash werkwoord | /ʌnˈliʃ/ | loslaten, vrijlaten |
| vapor zelfstandig naamwoord | /ˈveɪpɚ/ | damp |
| combustion zelfstandig naamwoord | /kəmˈbʌs.t͡ʃən/ | verbranding |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| rule out werkwoord | uitsluiten |
| turn out werkwoord | uitvallen, resulteren |
Uitspraak om op te letten
De spreker gebruikt 6 samentrekkingen en verkorte vormen, zoals couldn't, can't, didn't. Spreek ze kort uit, zoals je ze hoort.
- De klanken “sh” en “zh”: carbonaceous /kɑːbəˈneɪʃəs/, unleash /ʌnˈliʃ/
- Lange woorden — let op de klemtoon: carbonaceous /kɑːbəˈneɪʃəs/, meteorite /ˈmi.ti.əˌɹaɪt/, originate /əˈɹɪd͡ʒɪneɪt/, photosynthesis /ˌfoʊ.toʊˈsɪn.θə.sɪs/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: freeze /ˈfɹiːz/, splendid /ˈsplɛndɪd/
- /æ/ — opener dan de Nederlandse “e”: mismatch /ˈmɪs.mæt͡ʃ/, atom /ˈætəm/, collapse /kəˈlæps/
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 comet, hydrogen, chondrite.
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.