The Water Cycle | Precipitation Education
网页The water cycle describes how water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into rain or snow in clouds, and falls again to the surface as precipitation.
Water cycle - Wikipedia
网页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.
Water cycle, from evaporation to condensation to precipitation ...
网页The cycle begins at sea. Heat from the sun evaporates water from the oceans. Water rises into the air as vapor and travels with the wind. If the air begins to cool—such as when air warmed by the Earth's surface rises or when wind drives air up and over mountains—the air loses its ability to hold water. Clouds in the sky are volumes of air ...
Water cycle | Definition, Steps, Diagram, & Facts | Britannica
网页2024年9月15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 - National Geographic Society
网页2024年4月29日 · Earth’s water cycle began about 3.8 billion years ago when rain fell on a cooling Earth, forming the oceans. The rain came from water vapor that escaped the magma in Earth’s molten core into the atmosphere.
Hydrologic Cycle - National Geographic Society
网页2023年10月19日 · The water cycle consists of three major processes: evaporation, condensation, and precipitation. Evaporation. Evaporation is the process of a liquid's surface changing to a gas. In the water cycle, liquid water (in the ocean, lakes, or rivers) evaporates and becomes water vapor.
Water cycle - National Oceanic and Atmospheric Administration
网页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.
The Hydrologic Cycle - National Oceanic and Atmospheric Administration
网页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.
NASA Earth Science: Water Cycle | Precipitation Education
网页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 Water Cycle! - National Geographic Kids
网页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 “.
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