8. Use clean and labeled sketches to explain the difference between isolated and single chain Si-
O tetrahedron structure.
9. Use simple clean and labeled sketches to illustrate the following sedimentary structures: (A)
Cross-bedding, and (B) Graded bedding.
10. The shape, degree of sorting, and composition of the grains constituting sandstones can be
used to learn about the depositional environment of these rocks. Explain
11. Using simple graphs and sketches explain how earthquakes epicenters are located.