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Fresh Water Chapter 2
Fresh Water Chapter 2
29
Science
6th Grade
11/08/2010

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Term
Glaciers
Definition
Form in cold places where more snow falls than melts. Heavy layers of snow become solid ice. EX. Ice sheets on Antarctica
Term
Iceberg
Definition
The underwater part is bigger than the part above water. Only about TEN percent is visible above water.
Term
Runoff
Definition
Rainfall that flows over the ground surface. Affected by: flat/hilly land, nature of ground surface, rate of rainfall
Term
Erosion
Definition
Occurs when rivers wear away rock and soil
Term
Lakes form when:
Definition
Water collects in hollows left by melting ice, water fills the crater of a volcano, a dam blocks the flow of a river
Term
Eutrophication
Definition
Ex. a green film of algae in a fish tank
Nutrients in a lake build up over time causing an increase in the growth of algae
Term
Lake turnover
Definition
Seasonal change that refreshes the supply of nutrients throughout a lake
Term
Wetlands
Definition
Help control flooding by absorbing runoff from heavy rains. An area of land that is covered with a shallow layer of water during some or all of the year
Term
Permeable
Definition
Materials that allow water to easily pass through them
Term
Groundwater
Definition
Found in the saturated zone. Can be obtained from drilling a well into an aquifer
Term
Oxbow lake
Definition
A crescent-shaped body of water next to a river. Formed when a river breaks through the ends of a meander
Term
Delta
Definition
Formed when fast moving water of a river hits slow moving water in a lake or ocean and ends up slowing suddenly. As it slows deposits of sediment build up and form a delta near the mouth of a river.
Term
Lake
Definition
A body of standing water that is deep enough that sunlight does not reach the bottom.
Term
Divide
Definition
A ridge of land that separates two water sheds
Term
Saturated zone
Definition
The area of soil in which the pores are totally filled with water
Term
Water table
Definition
Top of the saturated zone
Term
aquifer
Definition
where people can obtain ground water by drilling a well
Term
deposition
Definition
Occurs when rivers build up landforms such as deltas
Term
Iceburgs
Definition
Form when the end of a glacier reaches the coast and breaks off
Term
Geyser
Definition
A type of hot spring from which the water bursts periodically into the air
Term
Two types of freshwater wetlands:
Definition
marsh and swamp
Term
Continental Glaciers
Definition
Ice sheets that spread over a large area of land
Term
Valley glaciers
Definition
Form in mountain valleys and look like thick rivers of ice sliding down into the valleys.
Term
Two types of glaciers
Definition
Continental glaciers and valley glaciers
Term
Water shed
Definition
Land area that provides water to a river system
Term
Meander
Definition
A cut off that may form an ox bow lake along side a river
Term
Reservoir
Definition
A lake that storres water for human use
Term
Headwaters
Definition
The many small streams that come together at the source of a river, fast moving,narrow and cold
Term
Nutrients
Definition
Dead leaves and other plant and animal material that adds to wetland waters
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