1. Suppose you work for a government office that needs to find a suitable place to bury barrels of poisonous liquid wastes. The soils that are used to bury the waste should have properties that will prevent the liquid from moving quickly down toward the groundwater—just in case the barrels begin to leak at some point. You should look for a soil with which type of texture?
   

Select one:

ASandy

BSilty

CClay Rich

DLoam 2. A sample of soil from a C horizon is light brown in color and has a high content of a mineral called feldspar. Which of the following statements is most likely true?

Select one:

AThe soil in the O horizon is also light brown.

BThe parent material rock had feldspar minerals in it.

CThe C horizon is very deep.

DThe soil in O, A, and B horizons supplied feldspar to the lower C horizon. 3. The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms.

Select one:

True

False

1. Which of the following best defines soil texture?
   

Select one:

AAmount of nutrients in the soil

BDepth of the soil

CA measure of how developed a soil is

DThe relative amounts of sand, silt and clay particles

1. Which of the following actions or events did not contribute to the Dust Bowl?
   

Select one:

AFarmers in the Central U.S. had plowed grasslands to grow food crops to feed the increasing human population.

BThey left the fields plowed and bare in the winter months when crops were not grown, and this left the soil exposed to wind.

CA long drought in the 1930s left the exposed soil especially dry due to the lack of precipitation.

DWith the advent of pesticides, minerals in the ground were leached.

1. Why is a rain drop a particularly damaging element to soil?
   

Select one:

AIt dilutes minerals in the soil.

BIt causes the soil to break apart and carries it away.

CIt often contains contaminants that poison the soil.

DIt prevents the aeration of the soil. 7. Due to a recent drought, a farmer has lost quite a bit of soil on his fields because:

Select one:

Athe rain has washed it away.

Bthe animals have been trying to eat the soil due to lack of food.

Cwind has carried away the dry soil.

Dthe plants have absorbed the soil.

1. A farmer fields, which are close to a stream, has experienced a lot of runoff. One possible effect of the runoff is that the stream will have a decreased level of fertilizers from the field.
   

Select one:

True

False