Grade 11 mass movement

1. Mass movement
Geography Grade 11 by Shaun Mamabolo

2. Descirbe different
types of mass
movemnt
1
Discuss different
factors that
influence the
degree of mass
movement
2
Develop
prevention
strategies for
mass movement
3
LESSON OBECTIVES:

3. Refers to the
downwards movement
of weathered debris
such as soil, stones,
tress, mud and rocks on
a slope as a result of
the force of gravity

4. FACTORS INFLUENCINGTHE DEGREE OF
MASS MOVEMENT
NATURAL INFLUENCES
• GRADIENT OFTHE SLOPE
• VEGITATION
• SOIL
HUMAN INFLUENCES
• DEFORESTATION
• MINING EXPLOSION
• OVERGRAZING

5. TYPES OF MASS MOVEMENT
Land slide
Large mass of land breaks
loose and plunges down a
slope.
Usually occurs along a fault
zone where a block of land
slides down hill.
Can be triggered by an
Earthquake

6. EARTHFLOW
• Occur in clay areas
when soil particles,
saturated with water,
move down slope.

7. MUDFLOW
A mud flow
is a type of
landslide
that occurs
when wet,
saturated
soil
becomes
liquefied
and flows
downhill in
a manner
similar to a
liquid.

8. IMPACT ON PEOPLE ANDTHE ENVIRONMENT
Using your own knowledge discussion the effects of mass movement
Effect of mass movement on people? (1x2)
-
-
Effect of mass movement on the environment? (1x2)
-
-

9. Strategies for minimising
effect of mass movement
• Maintaining vegetation
• Avoiding overgrazing
• Fencing and concrete slope
stabilise

11. • What is mass movement? (1)
• Name two mass movement
processes. (2)
• Discuss the factors that influence
the degree of mass movement.
(2x4)
• Differentiate between land slide
and earth flow. (2x4)
• Using the image from Google
earth develop prevention
measures for the landform from
mass movement (2x6)