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9.17 Warm-Up. Create a K.W.L chart of what you know and want to know about weathering, erosion deposition. Weathering, Erosion, and Deposition. W.E.D Cornell Notes. Weathering. The breakdown of rocks and minerals into sediment (smaller pieces) Types of Weathering:

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9.17 Warm-Up

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9.17 Warm-Up

  • Create a K.W.L chart of what you know and want to know about weathering, erosion deposition


Weathering, Erosion, and Deposition


W.E.D Cornell Notes


Weathering

  • The breakdown of rocks and minerals into sediment (smaller pieces)

  • Types of Weathering:

    • Physical: – breakdown without a change in chemical composition.

    • Chemical: the breakdown by chemical action.


Erosion

  • Movement of sediment from one location to another


Agents of Erosion

  • 5 main agents of erosion:

  • Running Water

  • Glaciers

  • Wind

  • Gravity

  • 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


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.

  • 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


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 = ErosionD = Deposition

E

D

E

D

E

D

D

E


E = ErosionD = DepositionEquilibrium = condition of a system in which competing influences are balanced

E

D

E

D

E

D

D

E


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.


9.19 Warm-Up

  • What factors increase stream/river erosion?

  • What factors would decrease stream/river erosion?

    Write your claim and evidence.


How do streams change shape?


Factors Affecting Stream Erosion Cornell 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 = ErosionD = Deposition

E

D

E

D

E

D

D

E


E = ErosionD = DepositionEquilibrium = condition of a system in which competing influences are balanced

E

D

E

D

E

D

D

E


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

  • 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:

    • Erosion

    • Deposition

    • Velocity

    • Gradient

    • Speed


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