Save
Upgrade to remove ads
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Mass Movement

TopicMaterial
Mass Movement or Mass Wasting All mass on earth is subject to the force of gravity. A firm surface beneath material keeps it from going any lower, supports it.
Mass Movement Cont'd. However, if the material rests on a slope, its stability is only conditional, and under certain circumstances,the ever present gravitational attraction will win out and move the material further downward.
Characterization 1. Type of movement 2. Type of material
Mass Movement Phenomena Only movement without the aid of a flowing medium is considered. That is, sediment transported by water, more or less as passengers, as the water makes its way down slope.
Mass Movement Phenomena Cont'd. Water or ice may be important to mass movement, but only as components of the mass that affect its characteristic and stability.
Type of Motion Mass movement phenomena can be described by 3 types of motion: Fall, Slip or Slide, and Flow.
Types of Material Any kind of loose material (regolith) that occurs at the Earth's surface. 3 Basic Types: Rock, Debris, Earth or Soil
Rate of Movement For any given type of motion and type of material, movement may proceed so slowly as to be almost imperceptible on a human time scale of reckoning events or swift w/ devastation.
Flow 1 Flows involve material that has been completely disrupted into many smaller elements that behave somewhat independently, allowing the material to behave as a fluid and flow downslope.
Flow 2 Flows occur in a wide range of materials from the large particles of rock avalanches, to the mixed particle sizes of debris avalanches, to the fine particles of mudflows.
Flow 3 There is also a wide range of rates of travel in flows. The slow complement to the rock avalanche is the rock glacier, and very slow flow of soil is creep.
Soil Creep Wherever unconsolidated fine material is in slope, creep occurs.Processes disturb sediment grains of the soil in random directions caused by...--->
1.Frost heaving-as soil moisture freezes it increases in volume, forcing particles apart and the slope surface outward. But as the ice melts, particles settle downward. 2. Plant roots, earthworms, and other organisms always in the soil. 3. Vibrations passing through the soil cause grains to separate, allowing them to settle. Result is soils flows very slowly down slope.
Solifluction In permafrost areas during the brief warm season thawing of the soil near the surface causes it to be saturated w/ water that cannot penetrate the ice below.This saturated soils flows gradually down even moderate slopes producing lobes evident on surface
Permamfrost Permanently frozen ground where the soil moisture freezes to great depth. Summer thaw doesn't last long enough to penetrate great depth. Only upper part of soil ever melts.
Combined Mass Movement Processes It is possible for one event to involve more than one type of mass movement process.
Stability of A Slope Driving mass <or= resisting mass + shear strength is balanced and Driving mass > resisting mass + shear strength (fails)
Factors Leading to Slope Failure Whatever causes the left side of the equation to be greater than the right = slope failure; increasing the driving mass;decreasing the resisting mass;reducing the shear strength of the slope; can be an affect of more than one.
Common Causes of Slope Failure Commonly occurs after periods of heavy rainfall. Earthquakes. Human activities.
Conditions Effecting Slope Stability Natural planes of weakness in the rock. Vegetation, their roots that are in the soil that bind it together and increase the shear strength of the material.
Created by: ebrinklow
Popular Earth Science sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards