The hydrosphere refers to all the water found on Earth, including oceans, rivers, lakes, and even the moisture in the atmosphere. It plays a crucial role in supporting life, regulating climate, and shaping the planet's surface. The vast majority of the Earth's water is contained in the oceans, which cover about 71% of the planet's surface. In addition to the oceans, the hydrosphere includes freshwater sources like rivers and lakes, which are essential for drinking water, agriculture, and industry. The hydrosphere also interacts with other spheres, such as the atmosphere and lithosphere, influencing weather patterns and geological processes.