List the soil types included in the coarse-grain category and the fine-grain category and the reason for the division into these categories. Problem 2- Clay is a soil material that possesses plasticity in the presence of water. What does the term "plastic" mean in relation to clay soil? Problem 3- What is the essential reason for the difference in behavior of natural clays and other soil types such as silts and sands? Problem 4- Why does the presence of water in a soil typically have a much greater effect on clays than on sand or gravel materials? Problem 5- Clays that expand or swell when in contact with water (such as montmorillonite clays" can cause problems for roads and structures supported on such soils. The expansive-swelling property can also make this type of clay almost impervious (acting as a barrier to the passage or flow of water), a feature that can be used as an advantage for handling the water and seepage conditions associated with some construction projects. Briefly, indicate the type of situation where this water barrier feature could be utilized. Problem 6- Briefly describe the phenomenon of liquefaction in soil deposits, indicating type and condition of soil required and occurrences responsible. Problem 7- Provide a brief description of dispersive lays and the typical construction related problems known to develop. Problem 8- State whether the following are true or false a. Aeolian soils are transported and deposited by wind b. Marble is an igneous rock c. Sandstone is a sedimentary rock d. Silts have no plasticity