Answer:
The hydrosphere corresponds to every liquid part contained in the planet. Oceans account for 97.2% of all water, which means that about 2/3 of the planet's surface is covered by oceans. Already the continental waters have a much lower percentage, being found in rivers, lakes (liquid state), glaciers (solid state, which by the way is the largest reserve of fresh water), aquifers and groundwater. Finally, the vapor-contained waters in the atmosphere give rise to precipitation.
