The hydrosphere interacts with, and is influenced by, all the other earth spheres. The water of the hydrosphere distributed among several different stores found in these other spheres. Water is held in oceans, lakes and streams at the surface of the earth.
Water is found in it's vapor, liquid and solid state in the atmosphere.
The biosphere serves as an interface between the spheres which aids in the movement of water between the hydrosphere, lithosphere and atmosphere. The hydrologic cycle traces the movement of water and energy between these various stores and spheres. Most of this water is salt water. Seemingly a small amount, the water stored as ice in glaciers would have a great impact on the environment if it were to melt into a liquid. One fear is that global warming will cause the melting and collapse of large ice sheets resulting in sea level rise.