https://www.britannica.com/science/water
water, a substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid, and solid states. It is one of the most plentiful and essential of compounds. A tasteless and odourless liquid at room temperature, it has the important ability to dissolve many other substances. Indeed, the versatility of water as a

https://en.wikipedia.org/wiki/Water
Water is an inorganic compound with the chemical formula H 2 O.It is a transparent, tasteless, odorless, and nearly colorless chemical substance, and it is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent).It is vital for all known forms of life, despite not providing food energy or organic micronutrients.

https://www.amnh.org/explore/ology/water/what-is-water
Water is a tiny molecule. It consists of three atoms : two of hydrogen and one of oxygen. Water molecules cling to each other because of a force called hydrogen bonding. It's the reason why water can do amazing things. Water is a shape-shifter. It exists in three states on Earth: liquid, gas, and solid:

https://en.wikipedia.org/wiki/Origin_of_water_on_Earth
Water covers about 71% of Earth's surface. The origin of water on Earth is the subject of a body of research in the fields of planetary science, astronomy, and astrobiology. Earth is unique among the rocky planets in the Solar System in having oceans of liquid water on its surface. Liquid water, which is necessary for all known forms of life, continues to exist on the surface of Earth because

https://www.nature.com/articles/d41586-023-03961-z
Water: a source of life and strife. Water is an essential resource, but it can also cause conflict, expose people to pollution and put communities at risk in the form of flooding. There is an old

https://water.org/our-impact/water-crisis/
A health crisis. The water crisis is a health crisis. More than 1 million people die each year from water, sanitation and hygiene-related diseases which could be reduced with access to safe water or sanitation. Every 2 minutes a child dies from a water-related disease. Access to safe water and sanitation contributes to improved health and helps

https://education.nationalgeographic.org/resource/earths-fresh-water/
Most people have heard Earth referred to as "the water planet." With that name comes the rightful image of a world with plentiful water. In photographs taken from space, we can see that our planet has more water than land. However, of all the water on Earth, more than 99 percent of Earth's water is unusable by humans and many other living things - only about 0.3 percent of our fresh water is

https://www.unep.org/explore-topics/water/about-water
Water covers more than two thirds of the planet, but readily accessible fresh water - found in rivers, lakes, wetlands and aquifers - accounts for less than 1 per cent of the world's water supply. As the global population grows, so too do the demands for water - for drinking, sanitation, farming and energy production, among many other uses. At the same time, human activity and climate

https://climatekids.nasa.gov/10-things-water/
The water molecules form rings when water freezes. All that space makes ice less dense. This is why it floats. This is great because ice floating on top of a body of water lets the rest of it stay liquid. If ice sank, whole oceans could freeze solid! Our bodies are mostly water. A newborn baby is 78 percent water.

https://www.nationalgeographic.com/environment/article/water
In fact, due to the dedicated efforts of governments and NGOs since the 1992 Earth Summit, safe drinking water has been made available to some 1.7 billion people around the world, with projects

https://earthobservatory.nasa.gov/features/Water
The Water Cycle. By Steve Graham, Claire Parkinson, and Mous Chahine Design by Robert Simmon October 1, 2010. Viewed from space, one of the most striking features of our home planet is the water, in both liquid and frozen forms, that covers approximately 75% of the Earth's surface. Geologic evidence suggests that large amounts of water have

https://www.natgeokids.com/uk/discover/science/nature/water-cycle/
The water cycle is also known as the "hydrologic cycle". Precipitation. When too much water has condensed, the water droplets in the clouds become too big and heavy for the air to hold them. And so they fall back down to Earth as rain, snow, hail or sleet, a process known as "precipitation". Collection

https://astrobiology.nasa.gov/education/alp/water-so-important-for-life/
Water is a liquid which allows the chemistry of life to take place. It is also a polar molecule which allows most other molecules to be dissolved. Because of this, we call water a "solvent". Having such a good solvent as water is critical for the functions of life. But there are also some other reasons why water is so important: Water is

https://worldwatermap.nationalgeographic.org/
In the process we threaten not only our own health, peace, and well-being, but also the health of ecosystems and wildlife. The information presented in the world water map is based on a global model developed at Utrecht University in the Netherlands. Led by National Geographic Explorer Marc Bierkens, this World Water Map helps us understand

https://en.wikipedia.org/wiki/Water_resources
Water resources are natural resources of water that are potentially useful for humans, for example as a source of drinking water supply or irrigation water. 97% of the water on Earth is salt water and only three percent is fresh water; slightly over two-thirds of this is frozen in glaciers and polar ice caps. The remaining unfrozen freshwater is found mainly as groundwater, with only a small

https://www.nasa.gov/earth/water-on-earth/
Learn how NASA studies water on Earth, from the oceans to the icecaps, and how it affects the climate and life on our planet.

https://climatekids.nasa.gov/water-cycle/
The water cycle is the path that all water follows as it moves around Earth in different states. Liquid water is found in oceans, rivers, lakes—and even underground. Solid ice is found in glaciers, snow, and at the North and South Poles. Water vapor—a gas—is found in Earth's atmosphere. Water can be found all over Earth in the ocean, on

https://gpm.nasa.gov/education/videos/water-water-everywhere
Water is all around us, and its importance to nearly every natural process on earth cannot be underestimated. The water cycle is the movement of water around the Earth in all its forms, from the ocean to the atmosphere, to snow, soil, aquifers, lakes, and streams on land, and ultimately backs to the ocean.This video explains what the water cycle is and how important it is to life on earth.

https://www.usgs.gov/special-topics/water-science-school/science/water-you-water-and-human-body
Water is of major importance to all living things; in some organisms, up to 90% of their body weight comes from water. Up to 60% of the human adult body is water. According to Mitchell and others (1945), the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%

https://kids.nationalgeographic.com/science/article/water-cycle
The water you're drinking might have come out of a dinosaur's nose! Before you spit it out you should know water has been everywhere. Water travels. The water you drink could have come from a volcano, then filtered through a giant sequoia tree, ridden the rapids, evaporated into the atmosphere, turned into grapefruit-sized hail, plummeted to the Earth, disappeared into a stream, then circled

https://climatekids.nasa.gov/menu/water/
Water is essential for life on Earth. From oceans to rivers to clouds in the sky, NASA satellites are observing where Earth's water is found--and how that is changing over time. ... What else do we need to find out? Weather & Climate. Weather. Climate. Atmosphere. Air. Carbon. Greenhouse gases. Water. Oceans. Rivers. Lakes. Energy. Renewable

https://www.earthobservatory.nasa.gov/topic/Water
Life finds ways to survive on this small volcanic island chain that's way off the beaten path. Published Jun 15, 2024. Image of the Day Land Water Human Presence. climate change, global climate change, global warming, natural hazards, Earth, environment, remote sensing, atmosphere, land processes, oceans, volcanoes, land cover, Earth science

https://education.nationalgeographic.org/resource/why-care-about-water/
Why Care About Water. There is the same amount of water on Earth today as there was when the dinosaurs roamed. And just less than one percent of the planet's water is available to meet the daily drinking water, sanitation and food needs of nearly seven billion people and millions of other species. Learn more about water in all its forms and how