Mass Movement

Mass MovementRock Falls, Avalanches, Soil Creep, Landslides, Mudslides….

Mass Movement

• This is the movement of _______________ downslope under the influence of ________________.

• This movement can be fast or slow.

• The three things that cause Mass Movement are:

– S___________ – W __________– Shortage of V____________

Types of Mass Movement

• Slow – Soil Creep (few millimetres a year)• Slow to fast – Bogbursts and Mudflows• Fast - Landslide

Chapter 6: Mass Movement• Loose material that has been weathered is called ______________. •Under the influence of ________________ this action is known as _________ _______________. •Different types of mass movement are distinguished by their ___________ which depends on the ___________________ of the slope.

Type of Mass movement Speed

Soil Creep

Slow to Rapid

Landslide

Soil Creep – the slowest type of Mass Movement

Soil Creep - effects

Soil Creep - effects

Trees and Poles bend, ripples appear on hillsides

Gentle slope: It is greatest near the surface.

3 signs of soil creep are:

_________________________________

_________________________________

_________________________________

Soil Creep: Slow

Bogbursts and Mudflows

• A bog burst occurs when heavy _______ falls on hills covered with layers of P____ or T_____.

• Mudflows happen when S________ R________ flows rapidly downslope.

Bogburst in Galway

Landslide & Avalanche

• Landslides are very rapid, fairly dry movements of regolith

• Avalanches are rapid movements of snow downslope

Rockfall

Rockfall (on Mars)

Talus/Scree

Freshly exposed cliff

Dust Cloud Shows this is dry mass movement

2008 Junior Cert – Short Question

2012 Junior Cert – Short Question

2010 Junior Cert