Water is an inorganic compound with the chemical formula H2O. It is a transparent, tasteless, odorless, [c] and nearly colorless chemical substance. It is the main constituent of Earth's streams, lakes, and …

Jun 8, 2026 · Water, substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid, and solid states. It is one of the most plentiful of compounds and has the …

Welcome to the science section of the USGS Water Science School, where you can explore the many aspects of water. All of our information is available by browsing the various categories below.

Jan 28, 2026 · Not only does water make up most of your weight, it’s involved in many important functions. See how water improves your overall well-being.

Water in three states: liquid (including the clouds, which are aerosols), solid (ice) and gas (water vapour) Water (H 2O) is a simple chemical compound made of two hydrogen atoms and one oxygen atom. It …

Feb 27, 2024 · In its purest form, it's odorless, nearly colorless and tasteless. It's in your body, the food you eat and the beverages you drink. All forms of life need it. What substance is more necessary to …

Sep 24, 2025 · The water cycle is the path that all water follows as it moves around Earth. Water changes between three states of matter — solid, liquid, and gas — in the water cycle. Liquid water is …