67) In a series of basaltic lava flows on Hawaii, the top and bottom of each flow is difficult to distinguish just by looking at the layers of rock. What are some rock characteristics (texture, mineralogy, etc.) and other features that you might use to recognize individual lava flows? 68) Fill in the missing rock names on the chart below. 69) What process is exhibited by the diagram below? When does this process take place? 70) In general, what happens in terms of composition as crystallization proceeds down the