The water cycle describes the continuous movement of water through evaporation, condensation, precipitation, infiltration, and runoff. It plays a critical role in distributing heat, maintaining ecosystems, and supporting life. For example, precipitation nourishes plants, evaporation cools surfaces, and rivers carry nutrients to oceans. Disruptions to the water cycle, such as deforestation and climate change, can lead to droughts, floods, and ecosystem imbalances. Preserving this cycle is essential for environmental sustainability.