IELTS Reading — Stage 3 (6): The Dark Rush for Seafloor Metals
Full passage, questions, and deep linguistic analysis in English.
READING PASSAGE
The Dark Rush for Seafloor Metals
A. Three kilometres beneath the Pacific Ocean lies a landscape no human has ever walked. Nodules the size of potatoes, rich in nickel, cobalt, and manganese, litter the abyssal plain like marbles dropped on a dark floor. For fifty years, scientists and engineers have speculated about harvesting them. What was once a curiosity is now a boom. A combination of rising demand for electric-vehicle batteries and stagnating supply from terrestrial mines has pushed governments and corporations toward a decision that environmental groups have spent years trying to delay: whether to begin large-scale deep-sea mining.
B. The case for extraction is straightforward. Electric vehicles require batteries, and batteries require metals that are increasingly scarce on land. Cobalt, used to stabilise battery cathodes, is mined under appalling conditions in the Democratic Republic of Congo, where child labour is widespread. Nickel, which determines a battery's energy density, comes overwhelmingly from a handful of countries with poor environmental records. Seafloor nodules, by contrast, lie on the surface, require no tunnelling, and contain no child labour. Proponents argue that harvesting them is not merely an economic opportunity but an ethical imperative.
C. The case against is equally powerful, and it comes from marine biologists who have spent decades studying the abyss. The seafloor is not empty. It is home to organisms found nowhere else — slow-growing corals, blind shrimp, and microbes that may hold the keys to new antibiotics. A single mining tractor, dragging across the plain, would stir up a plume of sediment that could travel for hundreds of kilometres, smothering life that has evolved over millions of years. Worse, the nodules themselves take millions of years to form. A single harvest would remove them permanently; there is no regeneration timescale that matters on a human horizon.
D. The regulatory framework, such as it is, centres on a body called the International Seabed Authority, established under the United Nations Convention on the Law of the Sea. The Authority has granted exploration contracts to two dozen entities, but it has not yet finalised the rules that would govern actual mining. Negotiations have dragged on for years, and the deadline — a self-imposed 2023 target — came and went without agreement. Meanwhile, several nations, notably small island states whose economies depend on healthy oceans, have called for a moratorium. Others, including Russia, China, and several European countries, have pushed ahead.
E. The most recent chapter in this dispute is an economic one. A 2024 analysis found that the projected cost of seafloor mining, once environmental safeguards are included, may make it uncompetitive with recycled metals. As battery manufacturers develop chemistries that use less cobalt, and as recycling rates improve, the demand for newly mined ore may simply not materialise. The mining companies point out that this argument cuts both ways: if recycled metals are sufficient, there is no reason to mine the seafloor at all. Environmental groups have embraced this logic, while industry has dismissed it as premature.
F. What is clear is that the decision will be made under conditions of profound uncertainty. No one has ever mined the deep seafloor at scale, which means no one knows what the ecological consequences would be. The precautionary principle — that in the face of unknown risk, one should err on the side of caution — has many adherents. But so does the argument that waiting for perfect knowledge is itself a choice, and that choice carries its own costs, measured in tonnes of cobalt dug from Congolese soil. The ocean, for now, waits.
QUESTIONS
Questions 1–4: Choosing Headings
Choose the correct heading for paragraphs B, C, D, and E.
| i. | The environmental case against extraction |
| ii. | Why the metals are needed and why land sources are problematic |
| iii. | A legal body struggling to set rules |
| iv. | How nodules formed over millions of years |
| v. | Economics may undermine the mining case |
| vi. | The role of small island states in the UN |
| vii. | New battery chemistries eliminate the need for all metals |
1. Paragraph B ____ 2. Paragraph C ____ 3. Paragraph D ____ 4. Paragraph E ____
Questions 5–9: YES / NO / NOT GIVEN
5. The seafloor nodules lie on the ocean surface.
6. Proponents claim deep-sea mining is ethically preferable to land mining.
7. The International Seabed Authority has already approved full-scale mining.
8. Small island states support immediate deep-sea mining.
9. Recycled metals are already cheaper than newly mined seafloor metals.
Questions 10–13: Sentence Completion (NO MORE THAN TWO WORDS)
10. Mining tractors would create a sediment ________ that could travel long distances.
11. The International Seabed Authority has issued exploration contracts but not finalised mining ________.
12. The precautionary principle argues for caution when the ecological consequences are ________.
13. Waiting for perfect knowledge has its own costs, measured in tonnes of cobalt from ________ soil.
ANSWER KEY
| Q | Answer | Q | Answer |
|---|---|---|---|
| 1 | ii | 8 | NO |
| 2 | i | 9 | NOT GIVEN |
| 3 | iii | 10 | plume |
| 4 | v | 11 | rules |
| 5 | NO | 12 | unknown |
| 6 | YES | 13 | Congolese |
| 7 | NO |
DEEP LINGUISTIC ANALYSIS
A. Sentence Architecture
Paragraph A, last sentence:
...pushed governments and corporations toward a decision that environmental groups have spent years trying to delay: whether to begin large-scale deep-sea mining.
- The colon after delay introduces the decision itself. This structure — build tension, then name the question — is common in journalism.
- Have spent years trying to delay — present perfect continuous, emphasising duration and effort.
Paragraph F, last sentence:
The ocean, for now, waits.
- A three-word sentence. Short sentences at the end of a long article create closure. The personification (waits) gives the ocean agency — it is not passive.
B. Vocabulary in Depth
abyssal (A) = belonging to the depths. From Latin abyssus (bottomless).
terrestrial (A) = on land. The contrast is terrestrial mines vs. seafloor mines.
moratorium (D) = a formal pause or ban. Not a permanent prohibition; a delay.
precautionary principle (F) = when risk is unknown, choose the safer option. Key concept in environmental law.
err on the side of caution (F) = choose the safer path even if uncertain.
C. Why the Tricky Answers Are Tricky
Q5: NO. The text says nodules lie "three kilometres beneath the Pacific Ocean" on the "abyssal plain." The question says they lie "on the ocean surface." Direct contradiction.
Q7: NO. The Authority "has not yet finalised the rules that would govern actual mining." The question says it "has already approved full-scale mining." Contradiction.
Q9: NOT GIVEN. Paragraph E says a 2024 analysis "may make it uncompetitive" — this is a projection, not a statement that recycled metals are already cheaper. The question uses present tense "are already cheaper," which the passage does not confirm. NOT GIVEN.
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