Geography Quiz on Erosion

What is the difference between erosion and mass movement?

• Rate of transport process

• Involvement of gravity directly

• Type of soil involved

• Water content in the soil

Which combination of factors most increases the risk of landslides?

• Clay soil, gentle slope, and moderate rainfall

• Sandy soil, low rainfall, and dense vegetation

• Clay soil, steep slope, and high rainfall

• Sandy soil, steep slope, and dense vegetation

Which of the following is the earliest indication of slow mass movement?

• Formation of large cracks

• Sudden displacement of houses

• Gradual tilting of fences or poles

• Roads buried by landslides

A researcher evaluates two locations with the same slope and rainfall, but one location has more severe erosion. The main factor that should be evaluated is...

• Microorganism activity

• Soil water content

• Land cover and vegetation

• Depth of the water table

In a technical report on landslide control, the use of retaining walls is deemed a failure. The best evaluative step to prevent future failures is...

• Adding weight to the top of the slope

• Replacing the entire slope with concrete

• Combining vegetation planting and subsurface drainage systems

• Increasing the use of geotextiles

Repeated gully erosion occurs after heavy rain on flat agricultural land. The best evaluation to prevent this from happening again is...

• Creating parallel ridges

• Establishing permanent drainage channels

• Lime application and adding organic matter

• Rainwater harvesting

Areas experiencing slow soil creep cause road infrastructure to be damaged every year. The most effective evaluative solution is...

• Relocating the road to a more stable area

• Resurfacing every year

• Planting large trees

• Creating a drainage system under the asphalt

How would you design a mass wasting mitigation system on a densely built slope that cannot be relocated?

• Drainage system, light retaining wall, and shallow vegetation

• Stopping construction and letting it be natural

• Draining water down the slope without control systems

• Raising buildings using piles

In land conservation planning, which action is most appropriate for areas dominated by channel erosion and high rainfall intensity?

• Soil liming

• Creating soakaway wells

• Applying contour farming

In land conservation, which action is most appropriate for areas with dominant channel erosion and high rainfall intensity?

• Soil liming

• Construction of infiltration wells

• Implementation of contour strip cropping

• Planting perennial crops