Mass movement Mass movement

Any kind of erosion by gravityAny kind of erosion by gravity

Makes mountains smaller Makes mountains smaller

Erosion – wears way surface materials and Erosion – wears way surface materials and moves them someplace else moves them someplace else

Agents of erosion Agents of erosion

Gravity Gravity Glaciers Glaciers Water Water Wind Wind

Deposition Deposition

Dropping of sediment when agent of erosion Dropping of sediment when agent of erosion loses energy loses energy

Gravity erosions Gravity erosions

Name Name of of erosion erosion

Speed Speed Physical Physical description description

Weathering that Weathering that causes it causes it

Slump Slump Fast Fast Mass of Mass of material slips material slips down a curved down a curved surface surface

Water weakens a Water weakens a layer of soil. Or a layer of soil. Or a strong layers lays strong layers lays on top a weaker on top a weaker layer layer

Slump Slump

Creep Creep Slow Slow Soils very Soils very slowly move slowly move down hill down hill

Ice Ice wedging wedging - -

Name Name Speed Speed Description Description Weathering Weathering Sketch Sketch

Rock fall Rock fall Fast Fast Blocks of Blocks of rock work rock work loose of loose of slope and slope and come come crashing crashing down often down often in spring in spring

Ice Ice wedging wedging heavy rain heavy rain

Name Name Speed Speed DescriptiDescription on

Weathering Weathering SSkkeettcchh

Rock Rock slide slide

Fast Fast Whole Whole layer of layer of rock slips rock slips down hill down hill

After heavy rains After heavy rains or earthquake or earthquake

Name Name SpeeSpeed d

Description Description Reason /Reason /weatheriweathering ng

Mudflow Mudflow Fast Fast Thick layer of Thick layer of loose loose sediment sediment moves moves downhill downhill

Removal Removal of grass ( of grass ( drought drought or fire) or fire) then then heavy heavy rain. rain.

Fan Fan shaped shaped deposit. deposit.

Mass movement Mass movement

All are on steep slope All are on steep slope Gravity causes all Gravity causes all Often occur after heavy rain ( or Often occur after heavy rain ( or

earthquake) earthquake)

Building on slopes. Building on slopes.

Pros? ( good things) Pros? ( good things)

Cons? (bad stuff) Cons? (bad stuff)

Ways to slow mass movement Ways to slow mass movement

Plant veggies (plants- grass trees) will help Plant veggies (plants- grass trees) will help hold soil in place. hold soil in place.

Drainage pipes – to remove water Drainage pipes – to remove water Concrete or stone walls – retaining walls Concrete or stone walls – retaining walls You may slow mass movements but you You may slow mass movements but you

can never STOP it can never STOP it