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 …

This program will highlight important freshwater habitats, build participants’ confidence and skills with hands-on field and laboratory activities, and present information on freshwater career and …

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 …

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 …

Jun 8, 2018 · The definition of freshwater is water containing less than 1,000 milligrams per liter of dissolved solids, most often salt. As a part of the water cycle, Earth's surface-water bodies are …

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

Freshwater lakes, however, contain well over 98 percent of the important surface waters available for use. Apart from that contained in saline bodies, most other continental waters are tied up…

Water is essential to life on Earth. It has three phases (solid, liquid, and gas). In these three phases, water ties together the major parts of the Earth’s climate system — air, clouds, the …

Freshwater habitats—such as lakes, rivers, streams, wetlands, and aquifers—house an incredible proportion of the world’s biodiversity: more than 10% of all known animals and about 50% of …

Sep 9, 2025 · EPA's Freshwater Explorer provides information about background and observed salt and mineral content for freshwater streams, lakes, and wells in all 50 U.S. states, Puerto …