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1. Amount of ________________. 2. Amount of ___________________. 3. Type of ______________________. 4. Shape of _____________________. 5. How land ____________________.
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Water Erosion
Water is responsible for a majority of all erosion on Earth
Runoff- after rain the water remaining on the surface is called runoff.› As runoff moves downhill, it forms small
grooves called ___________________.› As the rills flow into each other they
form ________________________.› Water continues to flow downhill and
becomes streams and rivers.
5 Factors that effect runoff
1. Amount of ________________. 2. Amount of ___________________. 3. Type of ______________________. 4. Shape of
_____________________. 5. How land ____________________.
MORE RUNOFF = MORE EROSION!
River Systems River systems start off with streams
feeding into rivers, then rivers feeding into larger rivers.
Any stream or river that feeds into a larger river is called a ____________________.
The land area from which a large river and all of its tributaries collect is called a ______________________.
Erosion by Rivers
Through erosion rivers create valleys, waterfalls, flood plains, meanders and oxbow lakes.
Rivers often begin in hilly or mountainous areas and flow fast and straight.
Rivers slow down as land flattens out and create ____________________.
A flood plain is a wide flat area along a river where excess water flows during a flood.
When a river slows down it often creates a ______________, a loop like bend.
If a meander gets cut off from the river, it forms an _____________________.
When a river slows down it deposits sediment.
If a river flows out of a mountain valley and deposits the sediment it is called a _______________.
A _______________ is created when a river flows into a still body of water, (a lake sea or ocean)
This constructive process creates deltas and alluvial fans:
A. ero
sion
B. weatherin
g
C. depositi
on
D. mass
moveme...
E. I d
on’t kno...
0 0 000
A. erosionB. weatheringC. depositionD. mass movementE. I don’t know
When a river stream meander becomes pinched off a(an) _______ forms.
A. delta
B. mean
der
C. allu
vial fa...
D. oxbow la
ke
E. I d
on’t kno...
0 0 000
A. deltaB. meanderC. alluvial fanD. oxbow lakeE. I don’t know
You would expect a youthful river to produce:
A. V-sh
aped va...
B. large delta
...
C. many oxbow ...
D. large allu
v...
E. I d
on’t kno...
0 0 000
A. V-shaped valleyB. large deltasC. many oxbow lakesD. large alluvial fansE. I don’t know
Enrichment Students will draw a picture of a river
system; they must include the following:› deltas, › alluvial fans, › meanders, › and oxbow lakes.
Trade and identify a partner’s picture.
