The liquid portion of the earth's crust is called the hydrosphere. The hydrosphere includes all the water on and below the earth's surface, such as oceans, rivers, lakes, and groundwater. It also includes the water vapor in the atmosphere, which can condense to form clouds and precipitation. The hydrosphere is an important part of the earth's system, as it regulates climate, supports life, and shapes the landscape through erosion and deposition.