How does soil form,How is soil degraded

#7 How does soil form? How is soil degraded (lost or sapped of nutrients)? How do the events that occurred during the “Dust Bowl” relate to this?
#9 What controls the grain size, grain shape, and sorting of grains by size in a sedimentary rock? What are the generalizations or rules that can be stated about these controls?
#12 What is a sedimentary (depositional) environment? Thoroughly summarize continental, transitional, and marine environments giving examples of each.
#15 What type of depositional environment is indicated by the presence of: a) coal, b) evaporite salt, c) travertine, d) limestone, e) sandstone, f) shale, and g) conglomerate?
#16 How does a pure quartz sandstone (aka a quartz arenite) form?
#17 Part B What is the sequence of sediments you would pass over if you were to walk from the shoreline and then swim in the offshore direction?
Other Questions
A) Discuss mechanical and chemical weathering, giving a specific example of each type of weathering.
B) Explain how the features pictured below formed:

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