Soils and fertilizers . eristically sandy? For what agricii/.tiTai : ;:iy are they frequently used ? 7- A- ir. »^ae soils usually rich or poor in plant-food materials ?Why? 8. State over what areas in the Ulted States lacustrip-i soilsare found. 9. Why do glacial soils resemble ohemiCrti^ . j .:;? a ^i-. jH whichthey were formed ? What is a characteristic dific/iiiee betweenresidual soil and glacial soil when both are formed from rocks richin plant-food materials? 10. Describe the mode of formation of the two principal kindsof seolian soils in the United States. Are they characteristically
Soils and fertilizers . eristically sandy? For what agricii/.tiTai : ;:iy are they frequently used ? 7- A- ir. »^ae soils usually rich or poor in plant-food materials ?Why? 8. State over what areas in the Ulted States lacustrip-i soilsare found. 9. Why do glacial soils resemble ohemiCrti^ . j .:;? a ^i-. jH whichthey were formed ? What is a characteristic dific/iiiee betweenresidual soil and glacial soil when both are formed from rocks richin plant-food materials? 10. Describe the mode of formation of the two principal kindsof seolian soils in the United States. Are they characteristically-eh or poor in plant-food materials, and in what one particularly ? ?.. Using any ;T!ap of thp United States as a base (preferably a•:;: :::,_- .?.:?-£; the state boundaries and river courses), drawJines ira::;.r;:;;-,--., -.:: -:yr;r,s ^td by residual, alluvial, marine,glacial, and a^olian soils. Thsss areas may then be shaded or coloreddifferently and a soil map of the U^ilid States thus be Plate VI. Stratification. — The upper figure illustrates stratifica-tion of rock, the lower stratification of soil. This shale rock has at onetime been soil. The soil may sometime be rock. SOIL FORMATION 29
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