Volcanoes and Igneous Activity Earth - Chapter...
Transcript of Volcanoes and Igneous Activity Earth - Chapter...
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WATER
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Distribution of
Earth’s Water
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WATER CYCLE Water constantly moves among the
oceans, the atmosphere, the solid Earth,
and the biosphere. This unending
circulation of Earth’s water
supply is
the water cycle.
Cycles on
Earth are
always trying
to remain in
BALANCE.
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Earth’s annual precipitation = the amount that
evaporates
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WATER CYCLESix Processes involved in the cycle are
• infiltration— movement of water into rock or soil
through cracks and pore spaces
• precipitation – falling rain, snow, sleet, hail, fog
• runoff – water flows into streams. lakes, oceans
• transpiration—the release of water
into the atmosphere from plants
Condensation – water vapor changes into liquid water
• evaporation – liquid water changes into water vapor
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Much of the water in soil seeps downward
until it reaches the…………..
zone of saturation - area where water fills all of the
open spaces in sediment and rock.
GROUNDWATER
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Groundwater – water within the zone of
saturation.
•water table - upper level of the saturation zone of
groundwater.
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Movement of underground water
• Groundwater moves by twisting and turning
through interconnected small openings.
• The groundwater moves more slowly when the
pore spaces are smaller.
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Movement of underground water
• Porosity - percentage of pore spaces
• Permeability - Ability to transmit water
through connected pore spaces
- Determines how much groundwater can be
stored
- Aquifers are
permeable rock
layers or
sediments that
transmit
groundwater
freely
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spring - forms
whenever the
water table
intersects the
ground surface.
Hot Springs
• Water is 6–9ºC warmer
than the mean air
temperature of the locality.
• Water is heated by
cooling of igneous rock.
WATER SUPPLIES
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Geyser
• Intermittent hot
springs
• Water turns to steam
and erupts.
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well - hole bored into the zone of saturation.
• An artesian well is any formation in
which groundwater rises on its own
under pressure.
• Pumping can
cause a
drawdown
(lowering) of
the water
table.
• Pumping can
form a cone of
depression in
the water
table.
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Overuse and contamination threatens groundwater
supplies in some areas.
• 1. Overuse -
Treating it as a
nonrenewable
resource
• 3. Land
subsidence
caused by its
withdrawal
2. ContaminationFertilizersPesticidesHighway saltsChemicalsIndustrial wastes
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Groundwater Contamination
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Erosion forms
most caverns
at or below the
water table in
the zone of
saturation.
A cavern is a naturally formed
underground chamber.
UNDERGROUND WATER FEATURES
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• Formed from calcite deposited
as dripping water evaporates
• Common features include stalactites -hanging from the ceiling)
and stalagmites –growing upward from the floor.
CAVERNS
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• Travertine is a form of limestone that is
deposited by hot springs or as a cave
deposit.
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Sinkholes—surface depressions
KARST TOPOGRAPHY
Formed by dissolving rock at, or near, Earth's
surface
Area lacks good surface drainage.
- Sinkholes form
when bedrock
dissolves and
caverns collapse.
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