Water cycle | Definition, Steps, Diagram, & Facts | Britannica
2024年10月18日 · Water cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff. The total amount of water remains essentially constant.
Water cycle - Wikipedia
The water cycle (or hydrologic cycle or hydrological cycle) is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time.
The Water Cycle | U.S. Geological Survey - USGS.gov
2022年10月2日 · Circulation mixes water in the oceans and transports water vapor in the atmosphere. Water moves between the atmosphere and the surface through evaporation, evapotranspiration, and precipitation. Water moves across the surface through snowmelt, runoff, and streamflow. Water moves into the ground through infiltration and
Ocean circulation - Understanding Global Change
Ocean circulation. The ocean covers 71% of Earth’s surface and is constantly in motion. Large masses of water that move together, called ocean currents, transport heat, marine organisms, nutrients, dissolved gasses such as carbon dioxide and oxygen, and pollutants all over the world.
NASA Earth Science: Water Cycle | Precipitation Education
Precipitation, evaporation, freezing and melting and condensation are all part of the hydrological cycle - a never-ending global process of water circulation from clouds to land, to the ocean, and back to the clouds.
The Hydrologic Cycle - National Oceanic and Atmospheric Administration
2023年3月24日 · The hydrologic cycle involves the continuous circulation of water in the Earth-Atmosphere system. At its core, the water cycle is the motion of the water from the ground to the atmosphere and back again. Of the many processes involved in the hydrologic cycle, the most important are: evaporation; transpiration; condensation; precipitation ...
The Water Cycle | Ocean Today
At its most basic, the water cycle is how water continuously moves from the ground to the atmosphere and back again. As it moves through this cycle, it changes forms. Water is the only substance that naturally exists in three states on Earth – solid, liquid, and gas.
Water cycle - National Oceanic and Atmospheric Administration
2019年2月1日 · The water cycle shows the continuous movement of water within the Earth and atmosphere. It is a complex system that includes many different processes. Liquid water evaporates into water vapor, condenses to form clouds, and precipitates back to earth in the form of rain and snow.
What is the Earth's "water cycle?" | U.S. Geological Survey - USGS.gov
The water cycle, also known as the hydrologic cycle, describes where water is stored on Earth and how it moves. Water is stored in the atmosphere, on the land surface, and below the ground. It can be a liquid, a solid, or a gas. Liquid water can be fresh or saline (salty). Water moves between the places it is stored.
Water Cycle - Understanding Global Change
Water molecules in the ocean can circulate for three thousand years, while water may only spend 2-6 months in rivers and streams, and hours to days in living organisms. However, even the water that enters the ground, where it can stay for hundreds to tens of thousands of years, eventually returns to the surface, where it can evaporate again ...