will be able to Explain what mass movement is and why it happens Describe both slow and fast mass movements using examples of each Investigate the impact mass movement can have on humans ID: 920224
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Slide2Learning IntentionsYou will be able to:Explain what mass movement is and why it happens.Describe both slow and fast mass movements using examples of each.Investigate the impact mass movement can have on humans.
Mass Movement
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Slide3Mass Movement9.1Mass movement is the movement of loose material down a slope under the influence of gravity The loose material is made up of soil, rocks and mud
This loose material is known as regolith
Slide4Mass Movement9.1Factors That Influence Mass MovementSlope or GradientThe steeper the gradient, the faster the loose material can move down the slope.VegetationRoots of plants and trees keep soil together and more stable. This can help to prevent mass movement.
Water
Water makes the
regolith heavier, causing it to move faster down the slope.
Human Activity
Humans can speed up mass movement by making upland areas unstable. For example, by creating roads or quarries in hillsides.
Slide5Types of Mass Movement9.2Soil creepGentle slope; very slow movementBog burstGentle to steep slope; may be rapid movementMudflowGentle to steep slope; rapid movement
LandslideVery steep slope; rapid movement
Mass Movement
Mass Movement
Slide6Types of Mass Movement9.2Soil CreepThe slowest type of mass movement and it occurs on gentle slopes.
Slide7Types of Mass Movement9.2MudflowMudflows occur when the soil and regolith become saturated with water, usually after heavy rainfall.They mix together to form mud, which then moves rapidly downslope.Mudflows are the fastest type of mass movement, with speeds of up to 100 km per hour.
Mudslide damage to house in Wisconsin
Slide8Types of Mass Movement9.3Bog BurstBog bursts can take place in these areas after long periods of heavy rainfall. If rain water cannot drain or soak away, peat can become saturated with water. Peat can then flow downslope and cause great damage over a large area.
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A bog burst
Attribution: Richard Webb
Slide9Types of Mass Movement9.3LandslideA landslide is the very rapid movement of regolith down a very steep slope. A landslide occurs when the slope becomes unstable.This can be caused by road-building, quarrying, earthquakes or sea erosion.
A landslide
A landslide
Slide10Video: Landslide Warning System