Chapter 7 Agents of Erosion and Deposition Section 1 Shoreline Erosion and Deposition Section 2 Wind Erosion and Deposit

1. Chapter 7Agents of Erosion and DepositionSection 1 Shoreline Erosion and DepositionSection 2 Wind Erosion and DepositionSection 3 Erosion and DepositionSection 4 The Effect of Gravity on Erosion and Deposition

2. Section 1 Shoreline Erosion and Deposition �Shoreline-a place where land and a body of water meet. �Wave energy �Waves-wind causing ripples �Wave Trains �Wave trains are a group of waves �Surf�breaking waves �Wave period-is the time interval between waves �The Pounding Surf �Breaks down rocks into sand

3. �Wave Erosion �Sea cliffs�are formed when waves erode and undercut rock to produce steep slopes. �Shaping a Shoreline �Many of the landforms along the shore are formed by wave erosion �Sea Arches �Sea caves �Headlands �Wave-cur terraces

4. �Wave Deposits �Sand, rock fragment. Dead coral and shells �Beaches �Any area of shoreline made up of deposited material �Wave Angle and Sand Movement �Long-shore current-moving sand in a zigzag pattern �Offshore Deposits �Sandbar-underwater exposed sandbar �Barrier split-exposed sandbar connected to the shoreline

5. Section 2Wind Erosion and Deposition The Process of Wind Erosion �Deflation-removal of fine sediment by wind �Desert pavement-surface consisting of pebbles and small broken rock �Deflation hollows-wind scoops out depressions in the land �Abrasion-grinding and wearing down of rock by other sand or rock

6. Wind-Deposited Materials �Loess �Fine material, windblown sediment �Feels like talcum powder �Dunes �Mounds of wind deposited sand �The Movement of Dunes �Slip face-steeply sloped side of a dune

7. Section 3Erosion and Deposition by Ice �Glacier-an enormous mass of moving ice �Glaciers-Rivers of Ice �Alpine Glaciers �Form in mountainous areas �Valley glacier-form in valleys created by stream erosion �Form u shapes �Continental Glaciers �Hugh, continuous masses of ice �Covers almost all of Antarctica 4000 meters thick �Glaciers on the Move �Move two ways -sliding and flowing �Climate affects the movement �Deck of cards

8. Landforms carved by Glaciers �Horns-sharp, pyramid-shaped peaks �Cirques-bowl-shaped depressions �Aretes-jagged ridges between two or more cirques �U-shaped valleys-glacier changes shape from a V to a U �Hanging valleys-small glacial valleys, that join deeper main valleys

9. Types of Glacial Deposits �Glacial drift-all material carried by glaciers �Till deposits �Unsorted rock deposited �Moraines �Lateral-form on the side of a glacier �Medial moraines-valley glaciers with lateral moraines meet �Ground moraines-unsorted material left beneath the glacier �Terminal moraines-dropped at the front of the glacier �Stratified Drift �Deposit that is sorted into layers �Outwash plain-deposit rock in a broad area �Kettle-depression

10. Section 4The Effect of Gravity on Erosion and Deposition �Mass movement-movement of any material �Angle of Repose �The steepest angle that material will not slide downhill �Rapid Mass Movement �Rock Falls-loose rocks falling down deep slopes �Landslides-sudden and rapid movement of material �Slump-most common-block of material moves down slope over a curved surface �Mudflows-rapid movement of a large mass of mud �Lahars-mudflows with volcanic origin

11. �Slow Mass Movement �Creep-extremely slow movement downhill