Earth Lakes Are Under: Threat Reading Answers [repack]

Rising global temperatures are not merely warming lakes; they are restructuring them. Warmer surface waters reduce oxygen solubility, leading to (low oxygen) in deep layers. Moreover, shorter ice cover periods—a decline of 15 days per decade in the Northern Hemisphere—allow more evaporation. A landmark study in Science (2022) found that warm-water lakes are losing oxygen 2–5 times faster than oceans.

The most pervasive threat to global lakes is climate change. Rising global temperatures alter the physical structure of lakes, leading to warmer surface waters and disrupting seasonal mixing patterns, a process known as thermal stratification. Warmer waters hold less dissolved oxygen, creating "dead zones" where aquatic life cannot survive. Furthermore, increased evaporation reduces lake volumes, while erratic rainfall patterns cause extreme flooding and prolonged droughts. For example, Lake Mead in the United States—a crucial reservoir for the Colorado River Basin—has fallen to historically low levels, a direct consequence of a multi-decade megadrought intensified by climate change. These changes do not just shrink lakes; they fundamentally alter their chemistry and ecology. earth lakes are under threat reading answers

Paragraph 4 defines eutrophication as agricultural runoff rich in nitrogen and phosphorus creating algal blooms. Lake Erie is mentioned as experiencing “annual harmful blooms” threatening drinking water. Rising global temperatures are not merely warming lakes;

Patterns and hotspots

Do the following statements agree with the views of the writer? A landmark study in Science (2022) found that