The hydrosphere includes all water on Earth in all its forms: liquid, frozen or vapour, meaning all water found in oceans, lakes, rivers, groundwater, ice, snow and glaciers. The biosphere also includes water bound up in life, such as the water in plants, fungi and animals. Of all the water on Earth, about 97.5 % is salt water, and only 2.5 % is fresh water.
The word hydrosphere comes from the Greek hydros = water and sphaira = sphere or ball.
Source
MeteorologienRed – Hydrosphere 
October 2023, TÄNKOM | Revised November 2023 RETHINK
