THE HYDROLOGIC CYCLE
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Transcript of THE HYDROLOGIC CYCLE
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THE HYDROLOGIC CYCLE
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A true cycle with no beginning or end.
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Nice and Simple...
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The Hydrologic Cycle
Defined as the movement of water on, above, and below the surface of the Earth.
Describes condensation of water vapor and formation of cloud droplets and eventually precipitation.
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Three Main Elements of H2O CycleEvaporation
Condensation
Precipitation
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EVAPORATION (Transpiration) The process of transforming
liquid water from the oceans and the soil to water vapor.
Water vapor is an invisible odorless gas that enters the atmosphere.
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CONDENSATION
The process of changing water vapor back to liquid water.
The process of forming cloud droplets. As water vapor rises, temperature
decreases in the atmosphere and condensation begins in the formation of tiny cloud droplets.
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PRECIPITATION
Cloud droplets collide and coalesce with neighboring cloud droplets.
As they grow in size and weight, cloud droplets form precipitation which falls from the sky as liquid water particles (rain) solid water particles (snow and hail)
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Other Processes...
Freezing Melting Sublimation Sublimation is the phase change from
solid to gas minus the intermediate step of forming liquid.
For example: The change from snow or ice to gaseous water without the step of liquid water formation.
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Cloud Formation
Clouds are visible masses of condensed droplets or frozen crystals suspended in the atmosphere.
Clouds are divided into two main categories
Convective or Cumulus (in latin: piled up)
Layered or Stratus (in latin: layer)
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Location of Clouds in Atmosphere Cumulus and stratus clouds are divided
into four more groups that distinguish the altitude location of the cloud. LOW (up to 6,500 ft.)
Stratus, nimbostratus, cumulus and stratocumulus
Characteristics of cumulus clouds Dense White and puffy (like cotton balls) Associated with good weather
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Locations continued...
LOW clouds (up to 6,500 ft.) Characteristics of stratus clouds
Dark gray Low lying Uniformly stratified or layered covering the
whole sky Usually associated with rain
MIDDLE clouds (6,500-16,500 ft.) Begin with prefix “alto” Includes alto stratus and altocumulus
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High Clouds
Above 16,500 ft. In the cold region of the troposphere Begin with prefix “cirro” or cirrus Often whispy or transparent
At this altitude, water freezes so the clouds are almost always composed of ice crystals.
High clouds include cirrus, cirrostratus, and cirrocumulus.
Aircraft contrails form in this altitude range.
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Questions?
Activity: “It’s Time to Get Cirrus With Clouds”