Earth Lakes Are Under Threat Reading Answers | 2K |

Nutrient pollution—primarily nitrogen and phosphorus from agricultural fertilizers, sewage, and industrial runoff—triggers . This process causes explosive algal blooms that block sunlight, deplete oxygen, and release toxins. According to a 2023 survey, over 60% of the world’s large lakes now suffer from moderate to severe eutrophication. Lake Erie, for instance, has experienced recurring “dead zones” where fish cannot survive.

The final sentence of Paragraph 4 states that hypoxia and pollution threaten “the livelihoods of 40 million people” around Lake Victoria.

(Lake Urmia's color changed because bacteria are increasing) 8. tourism