Causes and Effects Of Landslides Flashcards
(18 cards)
How do you explain gravitational force?What other two impacts affect the force?
It is a force that pulls materials downslope. Heavier material; increasing gradient =greater force.
What does a resisting force do?
Cohesion of slope materials and friction. Holds slope materials together and prevent of materials from falling down.
On what circumstances does the slope become unstable and collapse?
When the gravitational force is greater than the resisting force.
Name all the physical factors that cause landslides.(3)
Heavy rainfall, rock materials & steep slope.
Name all the human factors that cause landslides.(5)
Building and roads on the slope, heavy traffic, removal of vegetation, farming, & Poor maintenance of man-made slope .
How does water affect the stability of the slope?(3)
It reduces friction of slope and cohesion of slope materials & adds weight to slope materials.
What is the relationship between rain falls and landslides?(4)
Positively related, many landslides occurred in the wet, Summer months between May and September. Because too much rain water infiltrate into the slope materials, cohesion and friction are reduced.
What are the rocks usually made of on slopes?
Granite(hard)
What is the weakness of the rock material which is granite?(1)How does it affect the slope materials?(3)
It is easily weathered(broken down) in wet and hot climate. It is a loose material. It gets loosen in the soil. It reduces the friction and cohesion of slope materials.
What’s the affect of a steep slope?
Greater the gradient, greater the gravitational force.
How are buildings and roads made on the slope?
Slopes are cut to build roads and buildings.
How does building roads and buildings on the slope affect it?(3)
It increases slope gradient/Adds weight to slope/increase gravitational force
How does the heavy traffic affect the slope?(3)
Vibrations/loosen the soil/reduce friction and cohesion of slope materials
What is so bad about removal of vegetation?(3)
No roots held the slope materials/reduce friction and cohesion of slope materials/unstable
What is bad about farming on slopes?
Ploughing the soil loosens the soil.
What happens when the slopes do not have good maintenance?(3)
Broken drainage channels/allow more water to seep into the soil/adds weight to slope materials
What are the effects of landslides?(3)
Cause loss of lives and property/Damage water pipes, gas pipes and electricity cables (service disrupted)/slope materials(rock debris,sand & mud)block roads and stop traffic.
What is a slope failure?How to explain a landslide?
Slope materials (soil and rocks) may fall downslope under the force of gravity./Sudden and rapid movement of soil or rocks from slopes.
