Earth Lakes Are Under Threat Reading Answers ((better)) · Pro

Lakes contain roughly 90% of the planet’s liquid surface fresh water, yet they are disappearing and degrading at an unprecedented rate due to a combination of climate change and human interference. Rising global temperatures are causing many lakes to warm up to four times faster than the oceans, leading to lower oxygen levels, toxic algal blooms, and the permanent drying of entire ecosystems. Lakes Currently Under Severe Threat

Main threats

• Climate change: Warming alters thermal stratification, increases evaporation, reduces ice cover, shifts species ranges, and exacerbates harmful algal blooms.
• Water extraction & flow alteration: Irrigation, dams, groundwater pumping, and diversions shrink lake area and change residence time, concentrating pollutants.
• Nutrient pollution (eutrophication): Agricultural runoff and untreated sewage increase nitrogen and phosphorus, causing algal blooms, oxygen depletion, and fish kills.
• Pollution & contaminants: Heavy metals, plastics, persistent organic pollutants, and emerging contaminants (pharmaceuticals, microplastics) degrade ecosystem and human health.
• Invasive species: Non-native fish, plants, and invertebrates outcompete natives, alter food webs, and change water clarity and nutrient cycling.
• Land-use change & habitat loss: Urbanization, deforestation, and shoreline development destroy wetlands and buffer zones that protect lakes.
• Overfishing & resource exploitation: Unsustainable harvests reduce populations and disrupt trophic structure.
• Salinization and mineralization: Reduced inflows and irrigation return flows raise salinity in terminal lakes (e.g., Aral Sea, some inland lakes), harming biota.
• Sedimentation: Soil erosion increases turbidity, buries spawning grounds, and fills basins, reducing storage.

Section 2: Summary Completion

Complete the summary using words from the box or the text. earth lakes are under threat reading answers

Paragraph 5: The Tipping Point and Urgent Action

Scientists warn that many lakes are approaching ecological tipping points beyond which recovery becomes impossible. Dried lake beds emit dust and carbon dioxide, creating feedback loops that accelerate climate change. However, solutions exist: restoring natural river flows, reducing fertilizer use, treating wastewater, and cutting greenhouse gas emissions. The partial recovery of Lake Washington in the U.S. and Lake Biwa in Japan proves that intervention works—but only if implemented at scale and with urgency. Lakes contain roughly 90% of the planet’s liquid

Lakes hold about 90% of the world’s surface freshwater. However, recent studies and academic articles point to a disturbing trend of shrinking water levels, rising temperatures, and declining biodiversity. Key Themes in the "Earth Lakes are Under Threat" Passage Section 2: Summary Completion Complete the summary using