6 Mass Movements Landslides, mudslides, slump and creep landslide clip.mpeg
7 Shoreline ErosionErosion- the removal and transport of material by wind, water or iceWeathering- the breakdown of rock into smaller and smaller pieces by mechanical or chemical meansDeposition- materials are dropped
8 Shoreline Shoreline- where land and a body of water meet. Deposition- materials are droppedWaves are powerful agents of erosion and deposition
9 Waves Wind moves over the ocean= waves The size of the wave depends on the size of the windWaves may travel many kilometersWaves don’t travel aloneThey travel in groups called wave trainsBreaking waves are known as surfThe wave period is the time interval between breaking waves
10 Pounding Surf Energy is released when waves break A wave can break rock or throw broken rockWaves wash into cracks of rock and break off boulders (huge rocks) or sand.New beaches can form!
12 Wave DepositsWaves can carry materials, including sand, rock fragments, and shells.Beach- any area of the shoreline made up of material deposited by wavesNot all beaches are the same
13 Beaches are made of different types of material deposited by waves. Compare the beaches…Beaches are made of different types of material deposited by waves.
14 Stormy seas= pebbles and larger rocks Compare the beaches…Hawaii- eroded lavaPieces of seashellStormy seas= pebbles and larger rocks
15 Wave AnglesThe way sand moves depends on the angle of the waves on the shoreWaves come to shore at an angleWaves normally leave in an angle perpendicular to the shoreLongshore current- water near and parallel to the shoreline
16 Wave AnglesSand MovementLongshore CurrentWave Direction
34 AbrasionAbrasion is the grinding and wearing down of rock surfaces by other rock or sandStrong windsLoose sandSoft rocks
35 Wind Deposited Material All material carried by the wind is eventually depositedDunes (common in deserts and along shores)Loess
36 Loess is finer than sand. It feels like powder.
37 GlacierGlacier- mass of moving ice2 typesAlpineContinental Glacier
38 Glacier Form in areas of snow on ground all year High elevations Polar regions
39 Glacier Snow piles up snow packs crystals Giant ice mass “Rivers of Ice”- begin to move (gravity)
40 Alpine Glaciers Forms in mountainous areas Valley Glacier- form in valleys with streams flowing downhillForms a U- shape
41 Continental Glacier Not all glaciers are “rivers of ice” Can spread across entire continentsContinental glaciers- continuous masses of ice
42 Continental Glacier Continental ice sheet- largest type of glacier* Antarctica is almost completely covered by an ice sheetContains 91% of glacial ice on planet½ times the size of United StatesIt is 4,000 m thick in some places; covers everything except highest mountain peaks
43 Ice ShelvesIce shelf- an area where ice is attached to the ice sheet but resting on open waterRoss Ice Shelf- largest ice shelfAttached to ice sheet covering Antarctica