9.17 Warm-Up
• Create a K.W.L chart of what you know and
want to know about weathering, erosion
deposition
What You Know
What You Want to What You Learned
Know
WEATHERING, EROSION, AND DEPOSITION
W.E.D Cornell Notes
Key Words Notes
Summary:
Weathering
• The breakdown of rocks and
minerals into sediment
(smaller pieces)
• Types of Weathering:
1. Physical: – breakdown
without a change in chemical
composition.
2. Chemical: the breakdown by
chemical action.
Erosion
• Movement of sediment from one
location to another
Agents of Erosion
5 main agents of erosion:
1. Running Water
2. Glaciers
3. Wind
4. Gravity
5. Man
Weathering has to happen before erosion. The rocks
have to be broken into smaller sediments before they
can be eroded away.
Glacier
Wind Erosion
Mrs. Degl
6
Deposition
• To put or place something down
• Landforms that are created from
deposition:
– Deltas
– Alluvial Plains
– Levees
– Oxbow Lakes
– Sand Dunes
Brainpop: Erosion
W.E.D Frayer Models:
Weathering, Erosion, Deposition (3 total)
W.E.D Classification
• Decide if each statement is Weathering
(W), Erosion (E), or Deposition (D)
9.18 Warm-Up
Directions: Classify which agent of erosion
(water, wind, ice, waves, gravity) creates the
landform or event. Write question and answer.
1.
2.
3.
4.
5.
Canyons:___________
Sand Dunes:__________
Valleys:____________
Landslide:___________
Rounded Shells:___________
Stream Erosion
SPLASH LANDING WATER
SLIDE.3gp
• Describe the
motion of the
water slide riders
every time the
slide curves or
bends.
Stream/River K.I.M Chart
Key Word
Information
Memory Cue
Streams
• Streams are bodies of flowing water that
move downhill in a narrow, but defined
channel at least part of the year
• Stream channel : Long, depression
normally occupied by water
• Stream bed: Bottom of the channel
• Stream bank Side of channel
• Meander- Bend
or curve in a river
or a road
• Velocity- Speed
• Gradient- Slope
A Stream’s Life Cycle
• As a stream cuts into the surface and
carries away sediment, its channel
becomes wider, deeper and longer.
Youth Stage
• Flows quickly
• V-shaped
valley
Maturity Stage
• Less steep
gradient
• Water flows
slower
• Bottom flattens
• Meanders develop
Old Age Stage
• Slopes wear
away
• Water flows
slowly
• Highly curved
• Oxbow lakes
E = Erosion
E
E
E
E
E = Erosion
E
D
D = Deposition
E
D
E
D
E
D
E = Erosion
D = Deposition
Equilibrium =
condition of a
system in which
competing
influences are
balanced
E
D
E
D
E
D
E
D
Stream Erosion Lab
Water plays an important role in creating the landforms
found on Earth’s surface. Moving water can remove,
transport, or erode, pieces of rock, or sediments from their
original location. These eroded sediments are pushed
along by the moving water, sometimes for many miles and
sometimes for only a few millimeters. Where the
sediments end up coming to rest, or deposited, depends on
the size of the sediments and the force of the flowing
water. Sediments are deposited in those locations where
the force of flow becomes too low to push the sediments
any further. A delta is a depositional areas near the mouth
of a river, where the flowing river enters a non0flowing
body of water such as a lake or ocean.
Stream Erosion Lab
• Observation: Draw pictures and write your observations
in the boxes below for each stream bed. Then, answer
the observation questions.
• When finished, begin “Soil Erosion and Deposition”
Worksheet.
30 degree, 30 mL, Sand
60 degree, 60 mL, Sand
60 degree, 60 mL, Gravel
9.19 Warm-Up
1. What factors increase stream/river
erosion?
2. What factors would decrease
stream/river erosion?
Write your claim and evidence.
How do streams change shape?
Factors Affecting Stream Erosion
Cornell Notes
Key Words
Summary:
Notes
Factors Increasing Erosion
• If water speed increases, more erosion
occurs.
– Increased Gradient (slope)
– Large Volume of Water
– Water on outside of turns
– Little vegetation
E = Erosion
E
E
E
E
Factors Increasing Deposition
• If water speed decreases, more depositions
occurs.
– Decreased slope or flat land
– Decreased volume of water
– Water on inside of turns
– Vegetation on stream bank
• Deposition by streams results in LAYERS that
are SORTED
E = Erosion
E
D
D = Deposition
E
D
E
D
E
D
E = Erosion
D = Deposition
Equilibrium =
condition of a
system in which
competing
influences are
balanced
E
D
E
D
E
D
E
D
Depositional Features (Water)
1. Oxbow Lakes
2. Floodplain
& Levees
3. Deltas and
Alluvial Fans
Oxbow Lakes
- Wide stream
meander is cut off by
deposition to form a
lake
Floodplains & Levees
- Flooding causes water to move
over banks - sediments
deposited along sides
Deltas & Alluvial Fans
- Sediments deposited when
fast-moving rivers slows down
entering lake/ocean, etc.
STREAM EROSION &
DEPOSITION PRACTICE
At which location is the greatest amount of
sediment most likely being deposited?
(1) A (2) B
(3) C (4) D
A decrease in the velocity of this stream will most
likely cause an increase in
A.
B.
C.
D.
the amount of sediment carried by the stream
deposition within the stream channel
The size of the particles carried by the stream
Abrasion of the stream channel
• The cross section at right shows a stream
flowing downhill. Points A through D are
locations in the stream. At which point
would most deposition occur?
WED Writing Prompt
• You are a piece of sediment traveling in a
stream or river that deposits you in a delta.
Describe your journey. Include the following:
1.
2.
3.
4.
5.
Erosion
Deposition
Velocity
Gradient
Speed