Which statement correctly describes the water cycle?

The statement that water is constantly moving between the Earth and atmosphere accurately captures the essence of the water cycle. The water cycle, also known as the hydrological cycle, encompasses several processes including evaporation, condensation, precipitation, and runoff. Through these processes, water transitions between various states—liquid, vapor, and ice—constantly cycling through the environment.

This dynamic movement allows water to evaporate from bodies of water, rise into the atmosphere as water vapor, form clouds through condensation, and ultimately return to the Earth's surface as precipitation (in the form of rain or snow). This cycle is vital for maintaining ecosystems, replenishing freshwater sources, and regulating climate.

The other options present misconceptions about the water cycle. For instance, stating that water only evaporates ignores the critical processes of condensation and precipitation. Claiming that water never changes states disregards the fundamental nature of the water cycle, where water transitions between solid, liquid, and gas forms. Lastly, suggesting that water can only be found in rivers eliminates the vast reservoirs of water present in oceans, lakes, glaciers, and the atmosphere. Therefore, the correct statement emphasizes the continuous movement of water and its various transformations within the cycle.