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Hydrologic Cycle
(Water Cycle)
Hydrologic Cycle
Evapotranspiration (ET) is the sum of evaporation and
plant transpiration from the Earth's land surface to
Surface Runoff
Technical words
 Evaporation involves adding energy to molecules of a
liquid so that it becomes a gas in which the molecules
are further apart.
 Condensation is the reverse process in which
molecules of a gas give up energy, get closer together
and become a liquid.
 The water vapor in the air moves across the surface of
the earth as the atmosphere circulates. As warm, moist
air cools, water droplets form and fall to the land as
 Surface water that move across the surface of the land
and enters streams and rivers is known as Runoff.
Technical words
 The water that fills the space in the substrate is called
 The porous layer that becomes saturated with water is
called an aquifer.
Technical words
 A recharge zone is an area where water is added to
the aquifer.
 Infiltration is the process by which water on the
ground surface enters the soil.
 Percolation concerns the movement and filtering of
fluids through porous materials.
 The water cycle, also known as the hydrological cycle
or H2O cycle, describes the continuous movement of
water on, above and below the surface of the Earth.
 Soil water is water contained in pore spaces of soil or
adsorbed to the surface of soil particles.
 Transpiration: the root systems of plants absorb
water from the surrounding soil in various amounts.
Most of this water moves through the plant and
escape into the atmosphere through the leaves.
Fig. The composition of the soil
Fig. Infiltration of water into the soil
Examples of soil structure with pore
space (line drawing from USDA.)
Putting into order of Hydrologic Cycle
starting from the 1st occurring process
through the final one
Surface runoff
Evaporation + Transpiration
6. Sun energy