Erosion and Deposition

Breaking Down Processes Weathering The breaking down of the earth’s material by natural processes. Erosion The process by which weathered rock and soil particles are moved from place to place. Deposition The process by which weathered sediments are laid down in a new location creating new landforms.

5 Agents of Erosion Gravity Glaciers Wind Surface Water / Running Water Ocean Shoreline / Ocean Waves

Gravity Pulls rock and soil down a slope Called Mass Movement Rapid Rockslides Mudflow Avalanche Slow Slump Creep

Mass Wasting

Glaciers Carry very large to very small debris Most powerful agent Deposits Form piles called moraines Drumlins – little mounds Glacial lakes Kettle lakes U-shaped valleys

Glacial Erosion

Wind Removes loose material from the earth’s surface. Amount of material carried depends on wind speed Most active in deserts, plowed fields, beaches Deposits by wind Loess- layer of fine silt or sand Dunes- mounds of sand

Wind Erosion

Running Water MAJOR CAUSE OF EROSION When water moves it carries particle called the load. Speed of water determines the size of the load Creates canyons and valleys River deposits Delta Oxbow lake Flood plains

Waves Constantly erode and shape the shoreline. Formation Sea cliffs Sea stacks and caves Deposits Beaches Spits sand bars Barrier Islands