Earth Lakes Are Under Threat Reading Answers May 2026
Ballast water from cargo ships has introduced invasive species like the zebra mussel into North American and European lakes, outcompeting native species. Simultaneously, microplastics have been found in the most remote lakes, including Lake Hovsgol in Mongolia. These particles absorb heavy metals and are ingested by zooplankton, entering the food web at its base.
Reversing these trends requires integrated water management. Successful examples include the restoration of Lake Washington (USA) via sewage diversion and Lake Constance (Europe) via phosphorus bans. Emerging technologies include floating wetlands, nanobubble oxygenation, and AI-driven monitoring systems. However, without global carbon emission reductions, technical fixes alone will fail. earth lakes are under threat reading answers
| Word | Meaning | |------|---------| | Eutrophication | Nutrient enrichment leading to algal blooms and oxygen loss | | Algal bloom | Rapid growth of algae that blocks sunlight and releases toxins | | Hypoxia | Low oxygen levels in water, often causing fish kills | | Invasive species | Non-native organisms that harm local ecosystems | | Thermal stratification | Layering of water by temperature, disrupted by climate change | | Desiccation | Drying up of a lake (e.g., Aral Sea) | Ballast water from cargo ships has introduced invasive
Human demand for irrigation and drinking water is literally draining lakes. The Aral Sea (a saline lake) has shrunk to 10% of its original volume. More recently, Lake Poopó in Bolivia disappeared entirely in 2015 due to mining diversions and drought. The Caspian Sea, Earth’s largest inland body of water, is currently dropping by 7 centimeters per year. | Word | Meaning | |------|---------| | Eutrophication
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