Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. The term excludes seawater and brackish water, …

Apr 3, 2025 · Every living thing on Earth needs water to survive, but more than 100,000 species, including our own, need a special kind of water that can only be found in certain places and is in very …

Water is the world's most precious resource. WWF protects freshwater ecosystems—securing clean water, healthy rivers, and biodiversity for people & nature.

Get a foundational understanding of freshwater wetlands: how they are defined by water, their major classifications, and their critical role in nature.

Other articles where freshwater is discussed: aquarium: Maintenance problems: The source of fresh water is usually water supplies from which chlorine and other additives have been removed, either by …

Jul 29, 2025 · From sustaining agriculture and energy to shaping landscapes and communities, freshwater is essential. NASA’s Earth science data helps the nation manage this vital resource, …

Jun 16, 2025 · Freshwater ecosystems are characterized by their low salt concentration, typically less than 1% (or 1 part per thousand). This distinguishes them from marine and estuarine ecosystems. …