Summary:
- Most of Earth’s water is salt water in the oceans.
- Most freshwater is frozen in ice caps and glaciers.
- Most liquid freshwater is under the ground in layers of rock.
- Of freshwater on the surface, the majority occurs in lakes and soil.
- What percentage of freshwater is found in living things?
- Water can remain in a particular location for a long time.
- Reservoirs for water include oceans, glaciers, ponds, or even the atmosphere.
- A substance is stored in a reservoir.
- The amount of time it stays in that reservoir is its residence time.