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6th Grade Freshwater at Earth's surface


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Water that doesn't sink in, but instead runs across Earth's surface.
meandering stream
a river that usually develops on low slopes and carries a lot of fine sediment, such as silt and clay
point bar
a pile of sand and gravel that is depositied on the inside of a meander
braided stream
streams with many bars and islands separated by river channels
Platte River is an example of...
braided stream
drainage basin
specific area that is drained by a stream
an elevated area of land that separates the drainage basin of one stream from the drainage basin of another
sediment that is carried by a stream
3 types of load
bed load, suspended load, dissolved load
forms where streams deposit sediment into a body of water
Alluvial fan
forms where a stream deposits sediment onto a flat area of land.
stream discharge
the volume of water flowing through a stream in a given amount of time. Measured in meters cubed per second.
region of land next to the stream channel that is covered by water during a flood
What are 3 ways streams are formed?
Natural lakes--formed when glaciers created large depressions in earth.
crustal movements--creating depressions that then filled with water
human-made--from dams for example
compoinds such as nitrates and phosphates that are used by plants, algae, and some plankton to help them grow
an increase in nutrients and organisms that is a normal part of a lake's life. Eventually the lake will become dry land.
mixing of lake water that causes nutrients from deep in the lake to move upward toward the surface.
areas of land that are covered with water druing some part of the year
wetlands where the most common types of plants are trees and shrubs...found where water is slow moving
a type of wetland that doesn't have many trees or shrubs...sometimes called wet meadows
formed in depressions that were created by glaciers...rain is the only source of freshwater here
point source pollution
pollution that enters water from a specific can see exactly where the water comes from
non-point source pollution
when pollution comes from a wide area such as lawns, construction sites, and roads...difficult to control because it's hard to tell where it comes from
environmental protection agency

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