The hydrosphere refers to all the water found on Earth, including oceans, rivers, lakes, glaciers, and groundwater. It plays a crucial role in supporting life, regulating climate, and shaping the planet's surface through processes like erosion and sedimentation. The majority of the Earth's water is contained in the oceans, which cover about 71% of the planet's surface. In addition to its physical presence, the hydrosphere is part of the water cycle, which involves the continuous movement of water through evaporation, condensation, and precipitation. This cycle is essential for replenishing freshwater sources and maintaining ecosystems. Understanding the hydrosphere is vital for managing water resources and addressing environmental challenges.