Mass Wastage

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Mass Wastage

• By
• Diana L. Duckworth
• Rustburg High School
• Campbell County, VA

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Mass Movement (Wastage)

• Loose soil material moves downhill
• large masses
• caused by gravity
• Factors affecting mass movement
• Steep slopes accelerate movement
• Lots of moisture provides lubricant

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Talus - piles of debris at base of cliff
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Columnar Joints Talus
Columnar joints in basalt.
Devils Postpile, California Talus at base
of slope Process rock fall
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Rock slides rock fall.
Watch out for fallen rock!
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Mudflow in Alaska
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Slumps - mass of soil rotates down steep slope
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Gros Ventre Landslide
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Frank Slide, Canada
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Soil CreepSlowest, most common
Notice how the layers at the top are leaning
downslope.
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Why is this tree trunk curved?
How did these rocks get in the stream?
Creep moves soil roots downslope tree grows
up toward light.
Landslides erosion removes small particles.