Lakes are temporary due to various natural and human-influenced factors, such as sediment accumulation, climate changes, and dam construction creating reservoirs.
Lakes are considered temporary bodies of water because they are subject to various factors that can cause their existence to change or disappear over time. Lakes may vanish due to sediment accumulation, diminishing water sources, erosion, or climate changes affecting their size and water supply. For example, during the last Ice Age transition, over 100 large lakes vanished in the western U.S. due to climate shifts.
Additionally, human activities like dam construction can create artificial lakes known as reservoirs. These human-made lakes can alter natural water systems further. Furthermore, the flow of rivers through lakes helps remove ions, preventing lakes from becoming as salty as oceans. This continuous flow, combined with the temporary nature of lakes, leads to their freshwater status compared to the high salinity of oceans.
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