Exam 19: Geographic Information About Soils

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Which of the following soil map units consists of the most severely eroded soils?

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C

The mapping unit code,CeB3 indicates the soil in this unit consists of Land Capability Class III.

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False

Soil mappers use a transect to find the boundaries between adjacent soils in a landscape.

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True

A group of soils generally found together in a landscape uniform in parent material but differing in topography and drainage is called a ______.

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Most United States county soil surveys are carried out at a ???___ order level of detail.

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In making a second-order (detailed)soils map,soil scientists typically obtain most of the necessary soil profile information by using _____.

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As one walks down a drainage catena augering holes in the soils,one expects to find gray colors and mottles nearer to the soil surface.

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If a 20 ha field is mapped as being within a single soil consociation,a composite single soil sample can be expected to represent the correct level of available (soil test)phosphorus for at 85% of the field.

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Which of the following soil map units consists of the most nearly level land?

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A soil association is a group of soils found together in a landscape that may differ in minor ways,but must all belong to the same soil order.

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Web Soil Survey provides information on the suitability of soils for construction of such projects as sewage lagoons,roads and streets,and septic tank drainage fields.

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Soil Associations are usually used for large scale soils maps.

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Soil profile descriptions as found in soil survey reports normally contain information about the color and texture of each horizon in the profile.

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In the United States,the government lead agency for most soil survey work is the _____.

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A 20 km long road would be a line __ cm long on a 1:200,000 scale map.

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For most planning projects using a geographic information system,getting the needed data into the system is the easy part,but developing the computer Tables and maps is extremely time-consuming and difficult.

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A lithosequence is _______.

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Which of the following scale ratios represents the largest scale map?

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A soil profile description gives the value for soil properties such as color and texture averaged over the entire profile.

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A stereo pair of air photos is particularly useful in studying _______ landscape features.

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