Franklin Pierce University

PA 210

Quiz 4

TRUE/FALSE QUESTIONS 1,2,4,7,9

1) Clay soil particle mineralogy is dominated by secondary silicate minerals

2.  Sands have a higher specific surface area and hold less water than silts

3. Soil structure is the arrangement of soil particles into groupings called _______________
4.  Biological processes of aggregation dominate in surface soils.

5. Optimum percent soil pore space for plant growth is approximately ___________

6. Pores that allow fast air movement and water drainage are called ________

7.  Fine-textured soils have higher total pore space than coarse-textured soils.

8. 5 cm³ of soil was an oven dry weight of 7.5 g. It’s bulk density in g/cm³ is

1.   3.2

3.   1.8

4. None of the above

9.  A soil with a lower total pore space has a higher bulk density

10. Soils liquified during the Loma Prieta earthquake because

1. 1. They were piled beyond their angle of repose

1. 2. They were expansive soils

1. 3. They contained loosely packed, weakly cemented sand grains

1. 4. They were unaggregated, fine textured soils