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Grade 8 -Chapter 6
Running Water and Groundwater
45
Science
Not Applicable
07/26/2005

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Term
run off
Definition
runoff flows over the earth's surface,
carries away soil paricles , and ends up into streams, lakes or ocean-it does not soak into the ground or evaporate
Term
water cycle
Definition
the undending circulation of water that moves among the oceans, atmosphere, solid earth and biosphere
Term
infiltration
Definition
the movement of surface water into rock or soil through cracks and pore spaces
Term
transpiration
Definition
water that has been absorbed by roots of plants and is realeased through the leaves into the atmosphere
Term
drainage basin
Definition
land area from which a stream gets its water

- largest in U.S. is the Mississippi River
Term
narrow valleys
Definition
-fast moving water- Vshaped valleys- many rapids and waterfalls-erode surrounding areas quickly{erodes stream bottom more than its sides]- example: Colorado River and Niagra River
Term
Wide valleys
Definition
-slow moving water- erosion makes the rapids and waterfalls disappear- valley floor is eroded {now broad and flat]- Ushaped - valley walls are far from the river- has meanders- examples: Missouri River and Ohio River
Term
meander
Definition
bends in a stream caused by a flat-bottomed valley that is near its base level-
river that becomes wider and winds back and forth in loops
Term
flood plain
Definition
the wide, flat area of land along a river and often covered with water when the stream floods.
Term
delta
Definition
triangular-shaped deposit of sediment located at the mouth of a river that flows into a lake or ocean.
Term
groundwater
Definition
is the water found in the zone of saturation

water that soaks into the ground and collects in spaces in rocks called pores
Term
porosity
Definition
the percentage of rock and sediment that has pore spaces
Term
permeability
Definition
the ability to release a fluid

soil and rock that allows water to pass through them
Term
impermeable
Definition
water cannot pass through a material because the pores are too small, not connected or no pores at all
Term
aquifer
Definition
layer of permeable rock that transmits water freely
Term
water table
Definition
upper layer of saturated rock
Term
arteasian well
Definition
water flows up to the surface due to natural pressure - no pump is used to get the water.
Term
springs
Definition
a natural flow of ground water that reaches the earth's surface

forms whenever the water table intersects the ground surface
Term
hot spring
Definition
a spring of heated groundwater, caused when the water is warmed by rocks that come into contact with molten magma under the earth's surface
Term
geysers
Definition
heated groundwater that erupts periodically onto the earth's surface - water is heated to high temperatures, expands and is forced out under pressure like steam out of a tea kettle.
Term
cavern
Definition
a large underground natural opening formed when the weathering of limestone leaves cracks and water leaks in
Term
sinkholes
Definition
a depression that forms when the roof of a cave collapses
Term
gradient
Definition
the slope or steepness of a stream channel
Term
stream channel
Definition
is the course the water in a stream follows
Term
tributary
Definition
a stream that empties into another stream
Term
base level
Definition
the lowest point to which a stream can erode its channel
Term
bed load
Definition
solid material that is made up of sediment to large to be carried in suspension
Term
capacity
Definition
the maximum load a stream can carry
Term
alluvium
Definition
sorted material (loose gravel, sand, silt or clay) deposited by a stream
Term
natural levee
Definition
a landform that parallels some streams
Term
flood
Definition
occurs when the discharge of a stream become so great that it exceeds the carrying capacity of its channel and overflows it bank
Term
divide
Definition
imaginary line that separates the drainage basin of one stream from another
Term
zone of Saturation
Definition
area where water fills all of the open spaces in sediment and rock
Term
well
Definition
a hole dug below the water table that fills with water
Term
travertine
Definition
a form of limestone that is deposited in a cave
Term
karst topography
Definition
landscapes that hve been shaped by the dissolving groundwate
Term
sinkhole
Definition
a depression made in an area where groundwaer has removed soluble rock
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