• 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.
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