Date post: | 15-Aug-2015 |
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONThis lesson introduces mass wasting which includes slow movements such as soil creep . Soil creep is explained and evidence of soil creep is also looked at. The factors influencing soil creep and the impact of soil creep are also examined.
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION1. Explain the term mass wasting (mass
movement)2. Differentiate between mass wasting and soil
erosion3. Classify types of mass movement 4. Describe the factors that contribute to soil
creep5. Draw and label a diagram showing soil creep6. Recognize the signs of soil creep7. Be aware of the impact of soil creep on natural
and man-made features
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION
Mass movement or mass wasting is used to describe all the down slope movement of weathered material (regolith) due to the force of gravity.
Weathered material is called regolith.
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION
Mass wasting refers ONLY to the movement of weathered material down slope whereas soil erosion is concerned
with the movement of soil by agents such as wind, ice, water.
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION
The types of mass movement may be classified according to:
Speed of movement
Amount of moisture (water content)
Type of material being moved
For this lesson mass movement will be classified according the speed of movement.
6
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION Rapid movement
Flow movements
Slow movement
Landslide Earth flow Soil creep
Rock fall Mud flow Rock creep
avalanche Solifluction
7
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION Soil creep is the slowest of all mass movements. It takes place at a rate of 1-3 mm per year in temperature latitudes and 10 mm per year in tropical forests.
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION This type of movement is imperceptible and continuous.
This downhill movement of soil takes place on gentle moderately steep slopes.
9
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION
TILTED FENCE
BENT TREE TRUNK
10
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION
TERRACETTES
Step-like features that develop when vegetation is stretched and torn.
terracette
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONGravity -Everywhere on the Earth’s surface the force of gravity exerts a downward pull on all materials, such as soil and loose rocks (weathered material). All the different kinds of mass wasting are due to the force of gravity i.e. all down hill movements are influenced by gravity.
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION Moisture - water acts as a lubricant aiding movement downhill. Movement is greatest during or immediately following heavy rainfall, especially if rain comes after long dry periods.
Soil creep does not require a lot of moisture, but water does aid in the movement of soil down slope.
13
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION Weathered soil – when the soil has been weathered , is poorly consolidated or is disturbed for example by trampling by animals soil creep may occur.
Weathering weakens the soil making susceptible to soil creep, that is soil continuous movement down hill
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION Slope angle- the degree of steepness will influence the speed down hill movement. Soil creep occurs on gentle to moderate slopes.
Soil creep will not occur on flat land.
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION Soil creep is a slow down hill movement and therefore it is not as devastating as faster types of mass movement.
However the accumulation of soil behind a fence or a wall can lead to its destruction.
Layers of top soil may be lost and trees left without adequate support.
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OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION Are you ready to test yourself? There are five multiple choice items that you
are required to do. For each item, click on the letter of the correct
response and then click the button ‘NEXT QUESTION’ to continue.
Click the BEGIN QUIZ button to proceed.
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BEGIN QUIZ!BEGIN QUIZ!
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONAll of the following are classified as rapid types of mass wasting EXCEPT
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A. landslideA. landslide
B. Rock fallB. Rock fall
C. avalancheC. avalanche
D. Soil creepD. Soil creep
FEEDBACKFEEDBACKFEEDBACKFEEDBACK
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONQuestion 1: All of the following are classified as rapid types of mass wasting EXCEPT.
FeedbackD. Soil creep
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NEXT NEXT QUESTIONQUESTION
NEXT NEXT QUESTIONQUESTION
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONWhich of the following is evidence of soil creep?
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A. Trees shedding their leavesA. Trees shedding their leaves
D. Animals grazing on a slope D. Animals grazing on a slope
C. Water flowing down hillC. Water flowing down hill
B. Accumulation of soil behind a wallB. Accumulation of soil behind a wall
FEEDBACKFEEDBACKFEEDBACKFEEDBACK
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONQuestion 2: Which of the following is evidence of soil creep?
FeedbackB. Accumulation of soil behind a wall.
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NEXT NEXT QUESTIONQUESTION
NEXT NEXT QUESTIONQUESTION
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONWhich of the following factors does NOT influence soil creep?
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A. GravityA. Gravity
D. Rainfall D. Rainfall
B. Slope angle B. Slope angle
C. Vegetation cover C. Vegetation cover
FEEDBACKFEEDBACKFEEDBACKFEEDBACK
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONQuestion 3: Which of the following factors does NOT influence soil creep?
FeedbackC. Vegetation cover
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NEXT NEXT QUESTIONQUESTION
NEXT NEXT QUESTIONQUESTION
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONWhat is regolith?
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A. Saturated soilA. Saturated soil
D. An invisible forceD. An invisible force
C. Small step-like featuresC. Small step-like features
B. Weathered material B. Weathered material
FEEDBACKFEEDBACKFEEDBACKFEEDBACK
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONQuestion 4: What is regolith?
FeedbackB. Weathered material
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NEXT NEXT QUESTIONQUESTION
NEXT NEXT QUESTIONQUESTION
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONWhat is mass movement?
26
B. Removal of weathered material by running water.B. Removal of weathered material by running water.
D. Removal of soil and rock by wind.D. Removal of soil and rock by wind.
C. Downhill movement of soil and rocks due to the force of wind.C. Downhill movement of soil and rocks due to the force of wind.
A. Down hill movement of weathered material due to the force of gravity.A. Down hill movement of weathered material due to the force of gravity.
FEEDBACKFEEDBACKFEEDBACKFEEDBACK
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTIONQuestion 5: What is mass movement?
FeedbackA. Down hill movement of weathered material due
to the force of gravity.
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END OF END OF QUIZ QUIZ
END OF END OF QUIZ QUIZ
OBJECTIVESOBJECTIVES
What is mass wasting?
What is mass wasting?
Mass Wasting or Soil Erosion?
Mass Wasting or Soil Erosion?
Classifying Mass Movement
Classifying Mass Movement
Soil CreepSoil Creep
QUIZQUIZ
INTRODUCTIONINTRODUCTION You have reached the end of the quiz. If you wish to review this lesson, go to the first
slide. If you have finished viewing the lesson, click the
Close (X) button.
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