Natural freshwater ecosystems face unprecedented challenges in the modern era. Academic reading assessments often highlight these ecological crises to test comprehension and analytical skills. The specific text framework "Earth's lakes are under threat" serves as a primary example of how human activity and climate change intersect to damage global water security. Core Themes of the Reading Passage
Do you need help finding about the environment?
This passage, which appears in tests like the IELTS Trainer 2 , challenges readers to identify specific details and assess facts. Below are the correct answers and detailed explanations, based on the standard passage.
Lakes hold over 80% of the world’s surface freshwater. They are crucial for biodiversity, drinking water, and climate regulation. The reading passage titled is a widely used practice text in academic reading exams. It highlights how human activity and climate change endanger these vital ecosystems.
Drying lakes actively worsen climate change. When lake beds dry up, organic matter buried in the sediment is exposed to oxygen. This accelerates decomposition, releasing massive amounts of carbon dioxide and methane into the atmosphere, creating a dangerous environmental feedback loop. Reading Answers and Detailed Explanations
These questions often test your boundary knowledge. For example, a statement might claim that climate change is the only reason lakes are shrinking. The text, however, will usually state that human water diversion is an equal or greater factor, making the statement False .
Once Bolivia’s second-largest lake, it has essentially vanished. A lethal combination of global warming, persistent drought, and upstream irrigation projects has turned a thriving fishing hub into a salt-crusted desert. The Aral Sea (Central Asia):
This section details how humans divert river water for crops, citing specific historical examples like the Aral Sea. Question: Section D Answer: The Chemical Suffocation of Aquatic Life
Governments and industries regularly divert water from lakes and feeding rivers for agriculture and urban use. The Aral Sea in Central Asia stands as a classic historical example of this destruction, having shrunk to a fraction of its original size due to Soviet irrigation projects. Similarly, Lake Chad in Africa has decreased by over 90% since the 1960s due to a combination of over-extraction and severe droughts. 3. Agricultural Runoff and Eutrophication
The process of [eutrophication] occurs when agricultural fertilizers cause algae to multiply rapidly.
