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ch.21
underground water/ water erosion
44
Other
8th Grade
05/19/2008

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Term
groundwater
Definition
the second largest reserve of fresh water which acconts for 22% of the earth's fresh water.
Term
hydrolic cycle
Definition
when water continually moves from the continents to the oceans, into the atmosphere, and is carried back to the continents.
Term
transpiration
Definition
when plants absorb water from the ground and some of it's water escapes back into the air
Term
percolate
Definition
when water continues downward through pores, cracks, and other spaces between rock particles
Term
precipitation
Definition
rain or other sorces of water fall down to earth
Term
water table
Definition
upper seface of the ground water resivior, it's shape is irregular
Term
spring
Definition
a place usually on a hillside, where water comes from the ground continuously
Term
zone of aeration
Definition
the rock and soil above the water table, in which some are avalible spaces between rock particles filled with air instead of water.
Term
zone of saturation
Definition
the ground below the water table, in which every avalible space is filled with water.
Term
capillary action
Definition
a way water has worked it's way upward
Term
capillary fringe
Definition
the area where capillary action takes place.
Term
porous
Definition
many holes through out it's interior
Term
peremeability
Definition
the ability to hold ground water, or how easily it allows water to pass through.
Term
impermeable
Definition
material that doesn't permit water to flow through it, no matter how porous it may be
Term
permeable
Definition
material that transmits water easily, it contains many open spaces that are connected so that water can flow through them.
Term
perched water table
Definition
the surface that collects after an impermeable rock layer
Term
artesian well
Definition
a kind of unassisted water flow
Term
cone of depression
Definition
a cone shaped lowering of the water table that is deepest at the well
Term
recharge zone
Definition
an area that resupplies groundwater.
Term
solovent
Definition
a substance that dissolves something else
Term
hard water
Definition
water with high levels of dissolved minerals
Term
soft water
Definition
naturally low in calcium and magnesium compounds.
Term
caverns
Definition
a large cave
Term
speleogists
Definition
scientist who study caves
Term
drip stone
or
flow stone
Definition
any stone formed by dripping water
Term
speleothems
Definition
cave drip stone and flowstone that makes unusual shapes
Term
soultion caves
Definition
the largest underground caves that are fromed by erosion of great undergroundstreams flowing through soluble rock
Term
secondary limestone
Definition
deposited material from disolved limestone
Term
stalacttites
Definition
icicle like projections that hang downward from the ceiling.
Term
soda straws
Definition
fine tubular structures in which cacite precipitation leaves the center hollow, and is eventually filled in to form stalacgtites
Term
stalagmites
Definition
icicle like projections that project downward from the ceiling
Term
column
Definition
when a stalagtite meets a stalagmite
Term
curtains
Definition
thin sheets of flowstone hanging from the ceiling or inclined walls
Term
bacon
Definition
striped ribbons of flowstone
Term
sheleves
Definition
flat deposites of calcite that grew out from rock supports at the surface of standing water some time in the past.
Term
spelunker
Definition
a person who explores caves for recreation
Term
karst topography
Definition
chemical erosion of a rock that can produce a distinctive landscape.
Term
sinkholes
Definition
when a cave colapses
Term
sinkhole ponds
Definition
when sink holes fill with water
Term
natural bridge
Definition
when most of a cave colapses except for a short section
Term
disappearing streams
Definition
steepage from a surface stream can erode a joint in the underlying rock
Term
streamless valley
Definition
the bed that a stream abandoned
Term
appearing stream
Definition
cave stream erodes a hole in the side of a cave that opens in a hillside.
Term
tower karst topography
Definition
a country side is littered with tall towerlike hills that are eroded remnats of the original limestone strata.
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