Figure 5.26The Volcanic Explosivity Index indicates relative sizes of explosive eruptions. Source: After USGS Volcano Hazards Program. According to this figure, the VEI value assigned to an eruption is inverse exponentially proportional to its volume of erupted pyroclastics. O is inversely proportional to its volume of erupted pyroclastics. O is directly proportional to its volume of erupted pyroclastics. is exponentially proportional to its volume of erupted pyroclastics.

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A: What is the dip of the gray unit of Figure 4.15a?

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