Do Now: What factors do you think cause the land to move suddenly or fall apart on the surface of the Earth (cause a mass movement).

AIM: What is Mass Movement?

Mass Movement- the transfer of rock and soil down

slope due to gravity

*Mass Movements shape the landscapes on Earth

I. Triggers (causes) of Mass Movement

•Makes the soil/rock loose

(over saturated)

•Material falls off steep slopes (people make the land too steep)

• dislodges or move large amounts of rock

• roots hold together the soil.

II. Types of Mass MovementClassified by their speed and type of material that

is moving

• rock fragments move through the air

•movement of rock/material in contact with the surface.

Rock fall car

Japan landslideLandslides

•slow downward movement of material causing a curved appearance.

•Move quickly

•Occurs after/during heavy rains or rapid snow melt

•Move slowly

•Occurs on hillsides in wet regions

Rock fall fence (high energy)

III. Preventing Mass MovementWhat do people do to

prevent damage from mass movements?

- construct fences- build walls- put up signs

Closure:

- Take a “Types of Mass Movement” worksheet from the back top bin. You

have 10 minutes to complete both side and then we will go over the

worksheet.