The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow.
Water evaporates as water vapor into the air. Ice and snow can sublimate directly into water vapour.A huge concentration of these droplets over a large space up in the atmosphere become visible as cloud.
water vapour around the globe, cloud particles collide, grow, and fall out of the upper atmospheric layers as precipitation. Most water falls back into the oceans or onto land as rain, where the water flows over the ground as surface runoff. A portion of runoff enters rivers in valleys in the landscape, with streamflow moving water towards the oceans. Runoff and water emerging from the ground (groundwater) may be stored as freshwater in lakes.
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