Erosion the physical removal and transporting of rock material by natural agents such as water, wind or ice.

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Presentation transcript:

Erosion the physical removal and transporting of rock material by natural agents such as water, wind or ice.

Erosion due to rivers during flood stage.

Farm fields and crops eroded due to poorly draining soil, or topography

Shoreline erosion due to wave action of water

Down-cutting of river has eroded the canyon

Wind erosion Wind-blown sand (silica) erodes softer rock (shale, limestone) leaving behind the more resistant sandstone

Glacial erosion Rock trapped in moving ice scrape and carve striations in bedrock.

Sec Mass Wasting And Erosion

Type of mass movement Amount of waterTime / speedCompositionCauses Creep Slump Earthflow Mudflow Lahar 12.3 Mass Movement (pg )

Types of Mass Movement These are all types of Landslides!!!!! Creep: Slump: Earthflow: Mudflow:

Types of mass Wasting

Factors that Effect Landslides Water/rainfall Composition of the ground Amount of loose weathered material Triggers: Earthquakes Gravity/steepness of the slope Erosion (undercutting)

Rock slide

Rock slides: rock falls suddenly (without need for water), due to gravity

Talus: loose rock fragments that are pulled down by gravity and pile-up at the base steep slopes.

Creep

Soil creep

Soil Slump

A river bank that has “slumped”

Soil Slump

Debris flow / earth flow

The remains of the massive landslide are seen on Monday, March The landslide blocked the highway and the Stillaguamish River.

Mud flow

Mt. St. Helen volcanic ash lahar

Volcanic ash and water: Lahar

Sorting activity Amount of water /rainfall Rate / speed of movement