1. Freshwater has low amounts of salts or other dissolved solids in its concentration.
2. In Spanish, freshwater is sometimes described as "agua dulce," or "sweet water."
3. Just because it's fresh does not mean you can drink it.
4. Freshwater can be found both on and underneath the Earth's surface.
5. Only 2.5–2.7% of all water on Earth is freshwater.
6. Nearly all freshwater comes from precipitation (rain, snow, mist) from the atmosphere.
7. Rain-bearing clouds that come into contact with air pollution found in industrialized areas can cause acid rain.
8. All living organisms need water to survive, but some mammals with limited to no access to water can generate it themselves.
Desert rodents are known to generate water through the metabolization of certain seeds.
9. Some fish and aquatic creatures can move between fresh and saltwater environments.
Salmon and eel are known to use the hormones cortisol and prolactin (respectively) to assist in this process.