What Causes Mass Wasting

What Causes Mass Wasting?

Mass wasting sometimes called mass movement is the downward movement by gravity of rock regolith (loose weathered rock) and/or soil on the sloped top layers of the Earth’s surface. … It can be triggered by natural events like earthquakes volcanic eruptions and flooding but gravity is its driving force.Apr 10 2019

What causes mass wasting quizlet?

mass wasting erosion can be triggered when heavy rains or snow-melt saturate the surface. when pore spaces become filled with water (saturated) the cohesion between grains is destroyed allowing them to slide past one another.

What are 3 factors that contribute to mass wasting?

Mass wasting is influenced by slope material strength water content and amount of vegetation. Mass wasting can be triggered by storms earthquakes eruptions and human activity. Fall slide flow and creep are the main categories of mass wasting mechanisms.

What can cause a mass wasting event to begin?

Mass-wasting events often have a trigger: something changes that causes a landslide to occur at a specific time. It could be rapid snowmelt intense rainfall earthquake shaking volcanic eruption storm waves rapid-stream erosion or human activities such as grading a new road.

What human activity causes mass wasting?

One of the most common anthropogenic causes of mass wasting is road construction and this applies both to remote gravel roads built for forestry and mining and large urban and regional highways. Road construction is a potential problem for two reasons.

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What are examples of types of mass wasting quizlet?

Terms in this set (4)
  • Landslides. -most destructive -rock and soil slide quickly down steep slopes -can be caused by earthquakes.
  • Mudflows. -rapid downhill movement of mixture of water rock and soil -can occur after heavy rains in normally dry area -can be caused by earthquakes.
  • Slump. …
  • creep.

What is the single more important factor causing mass wasting?

Gravity is probably the ultimate driving force of mass wasting. The force of gravity pulls all things on the planet toward the center of the Earth. Without gravity mass wasting would not occur. But unlike many of the other factors humans have no influence or control on gravity.

What factor commonly triggers mass movements?


The transfer of rock and soil downslope due to gravity is called mass movement. Among the factors that commonly trigger mass movements are saturation of surface materials with water oversteepening of slopes removal of vegetation and earthquakes.

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What are the controls and triggers of mass wasting?

Steep slopes widely varying altitude ranges (relief) the thickness of the loose earth material planes of weakness parallel to the slopes frequent freezing and thawing high water content in the earth material dry conditions with occasional heavy rainfall and sparse vegetation are the factors that contribute to …

What factors affects mass?

Such factors include: weathering or erosional debris cover on slopes which is usually liable to mass movement the character and structure of rocks such as resistant permeable beds prone to sliding because of underlying impermeable rocks the removal of the vegetation cover which increases the slope’s susceptibility …

What are five events that can trigger a mass movement?

This wearing down or erosion is due to factors such as water the steepness of the slope the removal of vegetation and disruptive events such as earthquakes.

What are three possible causes of Oversteepened slopes?

erosion by rivers glaciers or ocean waves create oversteepened slopes. rock and soil slopes are weakened through saturation by snowmelt or heavy rains. earthquakes create stresses that make weak slopes fail.

Which is one of the most dramatic triggers of sudden mass movements?

Term what is mechanical weathering Definition the physical disintegration of rock resulting in smaller fragments
Term one of the most dramatic triggers of sudden mass movements is a(n) Definition earthquake

What are examples of mass wasting?

Mass wasting is the movement of rock and soil down slope under the influence of gravity. Rock falls slumps and debris flows are all examples of mass wasting.

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What is the fastest form of mass wasting?

rock fall

A rock fall are the fastest of all landslide types and occurs when a rock falls through the air until it comes to rest on the ground—not too complicated.

What humans can do to prevent mass wasting?

Engineering solutions include barriers and retaining walls drainage pipes terracing the slope to reduce the steepness of the cuts and immediate revegetation. Rockfalls can be controlled or eliminated by the use of rock bolts cables and screens and by cutting back slopes to lesser gradients.

What are the four factors that influence mass movements?

Factors that change the potential of mass wasting include: change in slope angle weakening of material by weathering increased water content changes in vegetation cover and overloading.

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What are the 4 types of mass movements?

There are four different types of mass movement:
  • Rockfall. Bits of rock fall off the cliff face usually due to freeze-thaw weathering.
  • Mudflow. Saturated soil (soil filled with water) flows down a slope.
  • Landslide. Large blocks of rock slide downhill.
  • Rotational slip. Saturated soil slumps down a curved surface.

What are four major categories of mass movements?

Mass movements
  • FAST.
  • SLOW.
  • DRY.
  • WET.

How might a forest fire influence mass wasting?

How might a wildfire influence mass wasting? It eliminates plants that anchor the soil. It makes the soil dry and loose and more easily able to move down steep slopes.

How does water trigger mass movements?

How does water trigger mass movements? Water fills the pores in sediment allowing the particles to slide past one another more easily. … If the steepness of a slope exceeds that angle mass movements become more likely.

What human activities cause landslides?

Human activities can increase landslide risks. They include clear-cutting mining and quarrying bad agricultural practices and construction activities.

What is spread in mass movement?

e) Spreads: A spread is an extension of a cohesive soil or rock mass combined with a general subsidence of the fractured mass of cohesive material into softer underlying material. The rupture surface is not a surface of intense shear. Spreads may result from liquefaction or flow (and extrusion) of the softer material.

What is the main cause of mass wasting Brainly?

Answer: mass wasting Once rock material has been broken down into smaller unstable pieces by weathering the material has the potential to move down slope called mass wasting (also called a mass movement or a landslide) because of gravity.

What are the effects of mass wasting?

Mass movements affect the following elements of the environment: (1) the topography of the earth’s surface particularly the morphologies of mountain and valley systems both on the continents and on the ocean floors (2) the character/quality of rivers and streams and groundwater flow (3) the forests that cover much …

What is flow in mass wasting?

Mass wasting – is movement in which bed rock rock debris or soil moves downslope in bulk or as a mass because of the pull of gravity. … Flow – The debris is moving downslope as a viscous fluid. A mudflow is a flowing mixture of debris and water usually moving down a channel.

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How is mass wasting different from other forms of erosion?

Erosion is the physical removal and transportation of weathered material by water wind ice or gravity. Mass wasting is the transfer or movement of rock or soil down slope primarily by gravity.

What classification is mass wasting?

15.2 Classification of Mass Wasting
Failure Type Type of Material
Creep or solifluction Soil or other overburden in some cases mixed with ice
Slump Thick deposits (m to 10s of m) of unconsolidated sediment
Mudflow Loose sediment with a significant component of silt and clay
Debris flow Sand gravel and larger fragments

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How are rockslides caused?

A rockslide is a type of landslide caused by rock failure in which part of the bedding plane of failure passes through compacted rock and material collapses en masse and not in individual blocks.

What is slump mass wasting?

A slump is a form of mass wasting that occurs when a coherent mass of loosely consolidated materials or a rock layer moves a short distance down a slope. Movement is characterized by sliding along a concave-upward or planar surface. … Translational slumps occur when a detached landmass moves along a planar surface.

Where all mass movements occur?

Mass movement often called mass wasting is the downslope movement of a mass of surface materials such as soil rock or mud. This mass movement typically occurs along hillsides and mountains due to the influence of gravity and can happen very slowly or very quickly.

During what season would you expect mass movements to be a greater threat?

Climate. During what season would you expect mass movement to be a greater threat? A wet spring before vegetation is growing.

Which mass movement poses the greatest risk to human life because it moves so quickly?

Mudslide poses the greatest risk to human life because it moves so quickly. Explanation: Mudslide is the gravity assisted movement of the debris.

Where do creeps occur?

creep in geology slow downslope movement of particles that occurs on every slope covered with loose weathered material. Even soil covered with close-knit sod creeps downslope as indicated by slow but persistent tilting of trees poles gravestones and other objects set into the ground on hillsides.

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