![]() The amount of water in rivers and lakes is always changing due to inflows and outflows. The definition of freshwater is water containing less than 1,000 milligrams per liter of dissolved solids, most often salt.Īs a part of the water cycle, Earth's surface-water bodies are generally thought of as renewable resources, although they are very dependent on other parts of the water cycle. ![]() Surface water includes the lakes, reservoirs (human-made lakes), ponds, streams (of all sizes, from large rivers to small creeks), canals (human-made lakes and streams), and freshwater wetlands. ![]() Just ask your neighbor, a tomato plant, a trout, or that pesky mosquito. One part of the water cycle that is obviously essential to all life on Earth is the freshwater existing on the land surface. Lakes are valuable natural resources, both for human and non-human life.
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