Concept #7 Quiz

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Chapter 6

Concept #7 Quiz

Choose the best possible answer to the following questions about Key Concept 7 "Soil erosion and controls on rates."

This activity contains 8 questions.

Which of the following is/are NOT a primary factor that influences the natural rate of soil erosion? Choose all that apply.

climatetype of vegetationslopesoil characteristicsage of the soil

Which of the following places the events in proper order?

gullies, rills, sheet erosion, streamsstreams, sheet erosion, rills, gulliessheet erosion, rills, gullies, streamssheet erosion, streams, rills, gulliesrills, gullies, sheet erosion, streams

Why is soil erosion an important issue?

Soil is necessary for groundwater flow, and without groundwater, no plants can grow, and no people can have drinking water. Soil is usually filled with earthworms which cannot survive without soil. Soil cannot form without plants, despite the fact that it can regenerate quickly, so quickly that levels of erosion can erase vegetation too quickly.Soil is necessary for plant growth, but soil takes much longer to produce than erode, so high levels of erosion can erase an area’s potential for producing crops.

What is “sheet erosion”?

Soil is moved by thin sheets of water. Soil is moved by running water in streams. Soil is moved by the power of the Sun and wind.Soil is moved downslope by gravitational forces, aided by the Sun.

What is the difference between a “rill” and a “gully”? Choose all that apply.

Gullies are simply the larger version of rills. Gullies are simply the smaller version of rills. Gullies are easy to remove for farm use, relative to rills. Gullies are difficult to remove for farm use, relative to rills.

At what point does “soil” become “sediment”?

When soil is on the bottom of a slope. When soil is produced and water is expelled.When soil makes it down slope and into a stream. When soil makes it to the ocean or a lake.

What are the significant factors controlling the rate of soil erosion?

slope, type of vegetation, type of soil type of vegetation, slope, presence of water, aridity climate, slope, type of soilclimate, slope, type of vegetation

What best promotes soil erosion by wind instead of water, and why?

Very wet conditions are produced by the presence of abundant water, causing soil to saturate and become “frictionless” enough to be transported by gravity.South-facing slopes receive more rainfall on average than do north-facing slopes, so soil is produced on the south-facing slopes so that wind can move it downhill.Drought conditions are produced by the absence of water, causing soil to dry out, and become “light” enough to be transported by wind.A region that has only a few large rainfall events in a year will not have enough water in the system to “hold down” the soil, and so wind can pick it up.

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