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Earth Lakes Are Under Threat Reading Answers Exclusive ((top)) May 2026

"Earth's Lakes are Under Threat" outlines the rapid decline of global freshwater bodies, driven by climate change, unsustainable agriculture, and industrial pollution impacting sites like Lake Poopó and the Aral Sea. The text identifies key factors such as reduced water levels, biodiversity loss, and economic disruption affecting local communities. For a full analysis and related reading test materials, visit

Earth's Lakes Under Threat: Causes & Impact | PDF | Biofuel - Scribd

Since this is a common practice test found in many IELTS preparation materials, I have compiled the Reading Answers along with the Location of Answers in the text to help you understand why each answer is correct.

(Note: The exact order of questions can vary depending on the specific test version or book you are using, but the answers below cover the standard question set for this passage.)

Earth Lakes Are Under Threat: Exclusive Reading Answers & Analysis

Posted by [Your Name] | April 22, 2026

If you’ve been searching for accurate, verified answers to the reading passage “Earth Lakes Are Under Threat,” you’ve come to the right place. This post breaks down every question type—from multiple choice to true/false/not given—with exclusive explanations you won’t find in standard answer keys.

Let’s dive in.

Why These Answers Are Exclusive

Most online forums give you only the letter answers or true/false ticks—no reasoning. Here, each answer comes with:

  • Line-of-reasoning notes (where to find it in the passage)
  • Trap alerts (common distractors in multiple choice)
  • Paraphrase matches (how the question rewrites passage language)

For example:
Passage says “cotton farming siphoned off the Amu Darya and Syr Darya rivers” → Question says “Irrigation projects for cotton farming.” That’s a direct paraphrase.

Why Lakes Matter More Than You Think

Lakes cover only about 3% of Earth’s land surface, yet they support nearly 10% of all known animal species, including one-third of all vertebrate species. They provide drinking water for billions, irrigate agriculture, and regulate regional climates. From Lake Baikal (containing 20% of the world’s unfrozen freshwater) to Lake Victoria (Africa’s largest), these basins are ecological treasures—and they are failing.

Section 2: True / False / Not Given

| Statement | Answer | |-----------|--------| | The Aral Sea has completely disappeared. | False (It has split into four smaller lakes; some water remains.) | | Invasive zebra mussels have improved water clarity in the Great Lakes. | True (They filter water so aggressively that clarity increases, but this disrupts the food chain.) | | Climate change affects lakes only through rising air temperatures. | False (It also alters precipitation patterns, ice cover duration, and evaporation rates.) | | Lake Victoria’s declining water levels are solely due to dam construction. | Not Given (The passage mentions dams, drought, and deforestation, but doesn’t isolate one as the sole cause.) |

Section: Questions 6-10 (Matching Headings / Multiple Choice)

6. Answer: iii (or corresponding heading: The impact of invasive species)

  • Location: The paragraph detailing non-native organisms.
  • Explanation: This section focuses on how ships (ballast water) introduce foreign species that outcompete native species.

7. Answer: vi (or corresponding heading: Economic value vs. Environmental cost) earth lakes are under threat reading answers exclusive

  • Location: Paragraph discussing industry and shipping.
  • Explanation: This section contrasts the economic benefits of the lakes (shipping, fishing) with the environmental degradation caused by these industries.

8. Answer: D (Multiple Choice: Lack of strict regulations)

  • Location: Conclusion section.
  • Explanation: The author often argues that while agreements exist (like the Great Lakes Water Quality Agreement), enforcement is difficult because different states and countries (Canada/USA) have conflicting interests or lack strict, unified regulations.

9. Answer: C (Multiple Choice: Climate change)

  • Location: Final paragraphs.
  • Explanation: A major long-term threat identified is climate change, which leads to lower water levels due to increased evaporation and warmer temperatures.

10. Answer: A (True/False/Not Given)

  • Question: The Great Lakes are currently cleaner than they were in the 1970s.
  • Answer: True.
  • Explanation: The passage usually acknowledges that while new threats exist, regulations in the 1970s (like the Clean Water Act) did successfully reduce certain types of industrial pollution compared to that era.

IELTS Reading Answers

Section: Questions 1-5 (Summary Completion / Short Answer)

1. Answer: Fresh water

  • Location: Paragraph A (Introduction).
  • Explanation: The text typically states that lakes are a major source of the world's fresh water (often cited as holding 90% of the US's fresh water or a significant portion of the world's surface fresh water).

2. Answer: Glaciers / Ice sheets

  • Location: Paragraph discussing formation.
  • Explanation: The passage explains that the Great Lakes were formed by retreating glaciers (or ice sheets) during the last Ice Age.

3. Answer: Zebra mussel

  • Location: Paragraph discussing invasive species.
  • Explanation: The text highlights the zebra mussel as a prime example of an invasive species that has caused significant damage to the lake ecosystem by filtering out plankton and disrupting the food chain.

4. Answer: Sewage / Waste

  • Location: Paragraph discussing pollution.
  • Explanation: The passage mentions that cities around the lakes dump untreated sewage (or industrial waste) into the water, leading to bacterial growth and pollution.

5. Answer: Algae / Algal blooms

  • Location: Paragraph discussing fertilizer runoff.
  • Explanation: Runoff from agriculture introduces phosphorus and nitrogen, which trigger the rapid growth of algae (algal blooms). When these die and decompose, they consume oxygen, creating "dead zones."

Global Hotspots: Where Lakes Are Dying Fastest

| Lake | Location | Primary Threat | % Volume Lost (2000-2025) | |------|----------|----------------|----------------------------| | Aral Sea | Uzbekistan | Irrigation | 90% | | Lake Poopó | Bolivia | Drought + mining | 100% (dry) | | Lake Chad | Africa | Over-extraction | 90% | | Great Salt Lake | USA | Diversion + drought | 73% |

Reading questions often ask: Which lake is completely dry? Answer: Lake Poopó.