How do human activities may cause mass wasting?
Humans can contribute to mass wasting in a few different ways: Excavation of slope or its toe. Loading of slope or its crest. Drawdown (of reservoirs)
Which of the following human activities can contribute to mass movement?
Which of the following human activities can contribute to mass movement? any human disturbance of a slop, including roadcuts, surface mining, and development.
Which of the following mass movements is most likely to occur in a geologic setting where the rock strata are inclined group of answer choices?
Geology100
| Question | Answer |
|---|---|
| As an erosional process, how is mass wasting unique from wind, water, and ice? | Mass wasting does not require a transporting medium |
| Which of the following mass movements is most likely to occur in a geologic setting where the rock strata are inclined? | rockslide |
How do freezing thawing wetting and drying contribute to soil creep?
How do freezing thawing wetting and drying contribute to soil creep? … –The soil becomes much weaker when dry and frozen. -Eventually these cause the soil and regolith to suddenly slide down the slope. The soil expands and contracts lifting particles and dropping them a slight distance downslope.
What’s the most common cause of mass wasting events?
Undercutting of the slope by excavation or erosion. Increased overburden from structures. Increased soil moisture. Earthquakes.
What is mass wasting Short answer?
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. Often lubricated by rainfall or agitated by seismic activity, these events may occur very rapidly and move as a flow.
How might a wildfire influence mass movement?
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.
What are the effects of mass wasting?
Debris avalanches and debris flows result in large, short-term increases in sediment and woody debris, channel scour, large-scale movement and redistribution of bed-load gravels and woody debris, damming and obstruction of channels, and accelerated channel-bank erosion and undercutting.
Which of the following classes of sedimentary rock is produced by weathering and erosion of pre existing rocks?
Which of the following classes of sedimentary rock is produced by weathering and erosion of pre-existing rocks? organic sedimentary rock.
What part of an angular fracture bounded granitic block shows the highest rate of weathering?
What portion of an angular, fracture-bounded granitic block shows the highest rate of weathering? The edges and corners.
How do the strength and the cohesion of clay rich regolith or soil change with the addition of water?
How do the strength and cohesion of clay-rich regolith or soil change with the addition of water? Water lowers the strength and cohesion.
How does mass wasting happen?
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. Often lubricated by rainfall or agitated by seismic activity, these events may occur very rapidly and move as a flow.
Which of the following is responsible for most types of mass wasting?
Increased water content within the slope is the most common mass-wasting trigger. Water content can increase due to rapidly melting snow or ice or an intense rain event.
What is landslide PDF?
INTRODUCTION. A landslide occurs when stability conditions of the slope is disturbed either by the increase. of stress imposed on the slope and / or by the decrease in strength of the earth material. building up the slope and it involves enmass downward movement of earth material under. the influence of gravity.
How does vegetation affect slope stability quizlet?
Vegetation affects slope stability in several ways. By absorbing the water from a rainstorm, vegetation decreases water saturation of a slope's material and the resultant loss of shear strength that frequently leads to mass wasting.
How might a wildfire influence mass wasting for example cause a debris flow )?
If a slope becomes any steeper than the angle of repose, then material will start moving downslope via mass wasting. How might a wildfire influence mass movement? Wildfire destroys plants which anchor soils and loosen upper layers of soils, increasing mass movement events.
What are causes of mass movement?
Gravity is the main force responsible for mass movements. Gravity is a force that acts everywhere on the Earth's surface, pulling everything in a direction toward the center of the Earth. On a flat surface, parallel to the Earth's surface, the force of gravity acts downward.
What are the major factors that cause mass wasting?
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. Increased water content within the slope is the most common mass-wasting trigger.
When an aqueous solution containing dissolved mineral matter evaporates why does the mineral matter precipitate instead of evaporating with the water?
5) When an aqueous solution containing dissolved mineral matter evaporates, why does the mineral matter precipitate instead of evaporating with the water? The molecules of mineral are too heavy to be evaporated at those temperature conditions and will remain behind in the solution until the solution becomes saturated.
How is weathering important to the process of erosion transportation and deposition?
Once the rock has been weakened and broken up by weathering it is ready for erosion. Erosion happens when rocks and sediments are picked up and moved to another place by ice, water, wind or gravity. Mechanical weathering physically breaks up rock.
What are rock joints?
joint, in geology, a brittle-fracture surface in rocks along which little or no displacement has occurred. Present in nearly all surface rocks, joints extend in various directions, generally more toward the vertical than to the horizontal.
Why does weathering of granite bedrock produce rounded shapes?
Spheroidal weathering is a type of exfoliation that produces rounded features and is caused when chemical weathering moves along joints in the bedrock.
Where rotational movement of soil is accompanied by downslope movement the feature that is observed is a?
A landslide is a downslope movement of rock or soil, or both, occurring on the surface of rupture—either curved (rotational slide) or planar (translational slide) rupture—in which much of the material often moves as a coherent or semicoherent mass with little internal deformation.
What can happen to the downhill toe of a slump during wet weather or times when snow is melting?
What can happen to the downhill toe of a slump during wet weather or times when snow is melting? The toe can become an earthflow.
What do you call the downward movement of soil rocks and earth materials along the slope?
A landslide is the movement of rock, earth, or debris down a sloped section of land.
What is modifying slope geometry?
Modification of slope geometry is a most efficient method particularly in deep seated landslides. However, the success of corrective slope regrading (fill or cut) is determined not merely by size or shape of the alteration, but also by position on the slope.
How can a submarine slide at the edge of a continental shelf create a tsunami?
As a submarine slide occurs, it can push water into a sea-surface bulge ahead of its path; this can result in tsunami initiation.; As a submarine slide occurs, it can result in a depression in the sea surface above the slide. A tsunami can form when water rushes in to fill the depression.
How does the addition of water onto a steep slope affect its stability?
Adding water increases slope instability. It lubricates rock fragments so that they slide down slope more easily. Mass wasting occurs more readily in rainy seasons for this reason. It turns out that a small amount of water in the soil can aid slope stability because of increased surface tension.
How might a forest fire influence mass wasting quizlet?
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 fire increase the potential for mass wasting?
Fire increases the potential for accelerated erosion primarily through its effects on vegetation and soil. As fire increases in severity, more vegetation is killed, more forest floor is consumed, and it becomes more likely that the physical properties of the soil and watershed are changed.