let’s look at page 32 of new geo. mass movement is the movement of any loose weathered material...

MASS MOVEMENT LET’S LOOK AT PAGE 32 OF NEW GEO

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Page 1: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

MASS MOVEMENTLET’S LOOK AT PAGE 32 OF NEW GEO

Mass movement is the

movement of any loose

weathered material down a slope

under the influence of gravity

Mass movement

WHAT CAUSES MASS MOVEMENT HUMAN TRIGGERS• OVER GRAZING

CATTLE

• DEFORESTATION

• ROAD BUILDING

• QUARRYING

NATURAL TRIGGERS

HEAVY RAINFALL

SNOW

EARTHQUAKE OR VOLCANOES

Page 4: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

How steep the slope is-

The amount of water present- The presence of vegetation- roots of trees

and plants bind the soil together and prevent movement

Human activity-

Factors affecting mass movement

Page 5: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

Page 6: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

MASS MOVEMENT CAN BE 1. FAST = LANDSLIDE/BOGBURST/MUDFLOW OR SLOW = SOIL CREEP

Page 7: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

SOIL CREEPSlow movement

Page 8: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

Soil creep is the downward movement of soil because of gravity

Soil creep is the slowest type of mass movement (1cm per year)

It may only be noticed when posts, fences or trees are tilted downhill

Soil creep

Page 9: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

Soil creep

Page 10: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

Regolith is weathered rock material

It includes soil and scree

Regolith

Page 11: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

LANDSLIDESFAST MOVEMENT

Page 12: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

A landslide is a very rapid movement of earth and rock down a steep slope.

Landslides happen when the slope becomes unstable

Landslides are very fast

Landslides

Page 13: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

Deforestation- cutting down of trees on a steep slope

Road buildingA sudden shock to the ground – due to an earthquake or a volcanic eruption

ErosionDiggers cutting under a steep bank or slope

Landslides occur because of

Page 14: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

landslide

Page 15: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

MUDFLOWSFast movement

Page 16: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

Mudflows are an example of very rapid mass movement

They occur on both gentle and steep slopes They occur after heavy rainfall, when the

soil is saturated and turns into a river of mud

They can occur after a volcanic eruption

MUDFLOWS

Page 17: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

mudflow

Page 18: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

BOGBURSTFast movement

Page 19: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

Bog bursts are common in upland areas that have a thick covering of peat

Upland areas have large amounts of rainfall and the peat may become saturated with water

When this happens the peat moves down the slope very quickly

BOGBURSTS

Page 20: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

bog burst

Page 21: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

HOMEWORK

Page 22: LET’S LOOK AT PAGE 32 OF NEW GEO. Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

THANK YOU!

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