Shadowing Practice: Dig Deep, Power a City - Learn English Speaking with Video
Creating lesson...
1
Let's punch a hole in the Earth to harvest power.
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Deep underground, leftover heat from our planet formation and radioactive decay heats up the surrounding rocks and water.
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We can use this heat to warm our homes or generate electricity.
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Dig a few meters down and you should hit a stable ground temperature.
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Then simply send water along an underground pipe and turn on your heat pump to produce warm air for your home.
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But why stop there?
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Digging a few kilometers deeper is tough, especially through hard, igneous rock.
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But if you pick a spot where the rock is warmed by magma itself, you can reach temperatures high enough to make steam, drive a turbine, and produce enough electricity to power a city.
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So, what's the catch?
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Well, as you pump water down to tap that heat, you've got to keep an eye on the pressure.
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Too high, and it can widen fissures and cause small earthquakes.
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Too low, worse if it's mixed with toxic compounds.
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But if you can get the steam safely back up to the surface, you can enjoy a steady stream of renewable energy from right under your feet.
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Vocabulary and speaking notes for this lesson
This B2 speaking lesson is built on the video “Dig Deep, Power a City”. This video has 13 sentences and 194 words to shadow. The speech runs for 1:03. The speaker talks fast, about 184 words per minute, so expect linked and reduced sounds. Only 77% of the words are among the 3,000 most common in English, so the vocabulary is demanding. 2 of its 13 sentences are questions, so it is good practice for question intonation and short answers.
Key vocabulary in this video
The 12 most advanced words in the video, with pronunciation and meaning:
| Word | Pronunciation | Meaning |
|---|---|---|
| fissure noun | /ˈfɪʃ.ɚ/ | A long, narrow crack or opening made by breaking or splitting, especially in rock or earth. |
| igneous adjective | /ˈɪɡ.ni.əs/ | Pertaining to or having the nature of fire; containing fire; resembling fire. |
| leftover adjective | Remaining; left behind; extra; odd; in reserve. | |
| turbine noun | /ˈtɜː.baɪn/ | Any of various rotary machines that use the kinetic energy of a continuous stream of fluid (a liquid or a gas) to turn a shaft. |
| radioactive adjective | /ˌɹeɪdioʊˈæktɪv/ | Exhibiting radioactivity. |
| surround verb | /səˈɹaʊnd/ | To encircle something or simultaneously extend in all directions. |
| decay noun | /diˈkeɪ/ | Rot; any processes or result of organic matter being gradually decomposed, especially by microbial action. |
| renewable adjective | /ɹɪˈnu.ə.bl̩/ | Able to be renewed; capable of renewal. |
| harvest noun | /ˈhɑɹ.vəst/ | The process of gathering the ripened crop; harvesting. |
| meter noun | /ˈmitəɹ/ | A device that measures things. |
| earthquake noun | /ˈɝθkweɪk/ | A shaking of the ground, caused by volcanic activity or movement around geologic faults. |
| compound noun | /ˈkɑmpaʊnd/ | Anything made by combining several things. |
Phrasal verbs you will hear
| Word | Meaning |
|---|---|
| heat up verb | To heat, to cause to become hotter. |
Grammar in this video
The structures the speaker uses most, with the exact words from the video:
| Structure | In the video |
|---|---|
| Passive voice be + past participle — the focus is on what happens, not who does it | is warmed |
How to practise with this video
- Listen to the whole video once without speaking and note the words you do not know.
- Start at 0.75× speed, shadow it sentence by sentence, then go back to normal speed once it feels easy.
- Record yourself and compare with the original, paying attention to words like fissure, igneous, leftover.
What is the Shadowing Technique?
Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.