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Flashcards in Mass Movement Deck (17)
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0
Q

Influences on mass movement. When is it fastest?

A

Mass movement is fastest when the slope is steep.

1
Q

Mass movement and what does it include

A

Is the movement of any loose material down slope under the influence of gravity.
This loose material includes loose rock mud and soil and is known as a regolith

2
Q

What does water act as?

A

Water acts as a lubricant making the regolith heavier and the surface slippery.

3
Q

What may create a steeper slope?

A

Cutting into hillsides during the construction of roads and railways may create a steeper slope.

4
Q

Vedgitation

A

The roots of trees and plants build the soil together and slows down the rate of mass movement.

5
Q

How is mass movement classified?

A
It's is classified by speed.
Soil creep        Slow
Land slides      Fast
Bog bursts       Fast
Mudflows         Fast
6
Q

Where can Soil creep occur?

A

Can occur on very gentle slopes.

7
Q

How is it noticed? (Soil creeps)

A

Might not be noticed except for the effect it has on surface objects eg. Learning poles, fences or walls

8
Q

Where is soil creep greatest?

A

Soil creep is greatest near the surface and decreases with depth.

9
Q

How do Landslides occur?

A

Sudden rapid movement of regolith down a slope.

May also occur along the coast line cliffs which have been undermined by sea erosion.

10
Q

Where is landslides found?

A

Most common in mountain areas.

11
Q

Cause of landslides

A

A road or railway cutting into steep slopes

12
Q

What is a Bogburst?

A

A bog burst is the movement of peat down a hillside.

13
Q

How is a Bog burst caused?

A

It is caused by heavy rain saturating the peat. Can be caused by human activity such as excavation.

14
Q

Where can a mudflow occur?

A

It can occur on both gentle and steep slopes.

15
Q

How is mudflow caused?

A

Torrential rainfall, saturated the soil and turns into mud.

Can also occur after volcanic eruptions.

16
Q

What is a laher?

A

A laher is a volcanic mudslide, the mud being mixed with ash and lava.