Introduction
Hydrologic cycle
Circular movement of water between oceans,
atmosphere, and land surface
Hydrologic—
Hydrologic—study of water
Objective: Draw a picture of the hydrologic
cycle. Include terms: Precipitation,
condensation, evaporation, transpiration, and
runoff.
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Copyright © 2008 Thomson Delmar Learning, a division of Thomson Learning, Inc.
ALL RIGHTS RESERVED.
Evaporation
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Radiant energy strikes Earth’
Earth’s oceans which
heats liquid water molecules.
This heating will cause the water to enter a gas
state evaporation
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Copyright © 2008 Thomson Delmar Learning, a division of Thomson Learning, Inc.
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http://www.atmos.uiuc.edu/earths_atmosphere/images/water_cycle/hydrologic_cycle2.jpg
Water Vapor and Condensation
Precipitation and Surface Water
Vapor condenses and collects as cloud
Clouds grow—
grow—so does liquid in them
Clouds driven over land by winds and liquid
water falls toward land surface as precipitation in
the form of liquid (rain) or solid (snow)
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Five pathways:
#1Collect
#1Collect on surface in lakes or ponds
Called surface water—
water—shallow or deep
#2 Collect as snow and ice to form glaciers
About 2 percent of all water on Earth in glaciers
Eventually melts and becomes water again.
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http://www.awi.de/fileadmin/user_upload/News/Press_Releases/2006/1._Quarter/Glacier2_p.jpg
http://www.kidsgeo.com/images/precipitation.jpg
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Evapotranspiration
Runoff
#4 Transpiration
Water taken up by roots and eventually
eventually reaches the
leaves where it evaporates back into atmosphere.
Called evapotranspiration or transpiration
#3 Runoff: rain or melting snow driven by
gravity and Collecting in streams and rivers
which may flow into oceans and lakes.
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http://www.ehponline.org/docs/2001/109-12/runoff.jpg
Infiltration and Groundwater
#5 Infiltration: movement of water into soil or
rock which is affected by:
Size
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http://www.bbc.co.uk/schools/gcsebitesize/img/bi05006.gif
http://www.westone.wa.gov.au/toolbox6/hort6/html/resources/visitor_centre/fact_sheets/images/et.jpg
Infiltration and Groundwater
Once water infiltrates it is called groundwater.
Remember: the hydrologic cycle is driven
by the Sun and gravity.
of pores—
pores—larger greater the rate
water in the pores
Amount of
More water in pores, less the rate
Saturation prevents infiltration, causes runoff
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http://www.dnr.state.wi.us/org/caer/ce/eek/earth/groundwater/images/infil.gif
Copyright © 2008 Thomson Delmar Learning, a division of Thomson Learning, Inc.
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http://www.ocrwm.doe.gov/ym_repository/studies/sitechar/images/infiltration.jpg
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