water erosion
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Water Erosion. Chapter 3 Section 2. Standard. S 6.2.a – Students know water running downhill is the dominant process in shaping the landscape S6.2.b- Students know rivers and streams are dynamic systems that erode, transport sediment in natural and recurring patterns. . Anticipatory Set . - PowerPoint PPT PresentationTRANSCRIPT
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Water ErosionChapter 3Section 2
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StandardS 6.2.a – Students know water running
downhill is the dominant process in shaping the landscape
S6.2.b- Students know rivers and streams are dynamic systems that erode, transport sediment in natural and recurring patterns.
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Anticipatory Set
Record how many drops a faucet releases in 1 minute
Place one bar of soap in a dry placePlace one bar of soap in a wet placeLet this go on for 10 minutesWhat happened after 10 minutes to each bar
of soap?
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VocabularyRunoff-water that moves over earth’s surfaceRill- runoff forms tiny grooves in the soilGully- large groove, or channel that carries
runoff from storms. Stream- a channel that water is flowing down
a slopeEnergy- the ability to do work or cause
change
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VocabularyLanguage of the
DisciplineFlood plain- flat, wide area of land along a riverMeander- loop-like bend in the course of a riverOxbow lake- a meander that has been cut off from
the riverAlluvial fan- a wide, sloping deposit of sediment-
formed when a stream leaves a mountain rangeDelta- sediment deposited where a river flows into a
lake builds up a landformLoad- the amount of sediment that a river carries
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Summer- water running, pebbles and sand move at the bottom of the river, it carries leaves downstream. Insects drink from the river
Winter- the stream freezes, chunks of ice grid away at the stream bed and banks.
Spring- stream floods and may be strong enough to move large rocks.
Streams- cause erosion because of the sediments it carries
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Runoff- water that moves over Earth’s surface.
Runoff that flows in a thin layer over the land is called sheet erosion.
5 factors Amount of rain Vegetation Type of soil Shape of land How people use the land
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Through erosion, a river creates valleys, waterfalls, flood plains, meanders and oxbow lakes.
Energy- the ability to do workAll along a river, the water’s energy does
work. Rivers often form on steep mountain slopesNear the mouth of a river, it is fast flowing,
and follows a straight and narrow course.
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Waterfalls- occurs when a river meets hard rock and erodes it slowly. It flows over the rock and then flows over softer rock downstream.
Softer rock wears away faster than harder rock
Floodplain- flat, wide area of land. This occurs when it overflows its banks during flooding
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A river is a dynamic system. A rivers slope, volume of flow and the shape of its
streambed all affect how fast the river flows and how much sediment it can erode.
The amount of sediment that a river carries is called a load.
Slope- if more water flows through a river, then its speed will increase.
Flow- the volume of water that moves past a point on a river in a given time
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