Which of the following refers to the endless circulation of water between the atmosphere and the earth?

The term that describes the continuous movement of water within the atmosphere and across the earth’s surface is known as the hydrologic cycle. This cycle encompasses various processes including evaporation, condensation, precipitation, infiltration, and runoff, illustrating how water transitions between different states and locations, such as from liquid to vapor and back again.

In the hydrologic cycle, water evaporates from bodies of water and land, enters the atmosphere, condenses to form clouds, and returns to the earth through precipitation, thereby sustaining ecosystems and replenishing water sources. This essential cycle is crucial for maintaining life and influencing weather patterns.

The other options do not accurately encapsulate this concept. Water recycling refers specifically to the process of reusing water, often in human-made systems, while the phrase "water cylinder" does not correspond to any recognized scientific terminology related to water movement. Fog, meanwhile, is an atmospheric phenomenon resulting from condensation but does not encompass the broader dynamics of water circulation.