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Why are lakes considered temporary features in geologic terms?
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Lake Ann in North Cascades National Park, Washington, U.S., viewed from the park's Maple Loop Trail. The North Cascades National Park is a large wilderness area that preserves majestic mountain scenery, snowfields, glaciers, and other unique natural features.
Lakes are considered temporary features in geologic terms because they are subject to physical, chemical, and biological processes that inevitably lead to their extinction.12
A lake's existence depends on a delicate hydrologic balance between water inflows and outflows. Over time, this balance is disrupted by several factors:13
- Infilling: Lakes are continuously filled by sediments, organic debris, and chemical precipitates. As sediment accumulates, the lake becomes shallower, allowing bottom-attached plants to spread lakeward, eventually transforming the area into a marsh or terrestrial land.145
- Geologic Processes: Natural forces such as the uplift and erosion of mountains or the movement of glaciers can destroy the basins that hold a lake.1
- Hydrologic Changes: Changes in drainage patterns, prolonged drought, or increased evaporation can deplete a lake's water supply, leading to its physical disappearance.16
While the lifespan of a lake can range from a few days to millions of years, these processes ensure that all lakes are transient features of the Earth's surface.12