1. LET’S LOOK AT PAGE 32 OF NEW GEO

2.  Mass movement is the movement of any loose weathered material down a slope under the influence of gravity

3.  HUMAN TRIGGERS OVER GRAZING CATTLE DEFORESTATION ROAD BUILDING QUARRYING  NATURAL TRIGGERS  HEAVY RAINFALL  SNOW  EARTHQUAKE OR VOLCANOES

4.  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-

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

7. Slow movement

8.  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

10.  Regolith is weathered rock material  It includes soil and scree

11. FAST MOVEMENT

12.  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

13.  Deforestation- cutting down of trees on a steep slope  Road building  A sudden shock to the ground – due to an earthquake or a volcanic eruption  Erosion  Diggers cutting under a steep bank or slope

15. Fast movement

16.  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

18. Fast movement

19.  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

22. and well done first years on reaching the end of first term in St Tiernan’s