[ ITALIANO ] Going to the freezer for a midnight snack, I pulled out a pizza whose form is portrayed in the geologic map (Fig. 1a). During mapping, I arbitrarily oriented the pizza with respect to north. The pizza, as shown, is arbitrarily oriented the pizza with respect to north. In most respects this was a normal pizza. A thin stratum of cheese rested atop tomato sauce and crust. And pepperoni, lightly dusted with cheese, was distributed across the face of the pizza. The diameter of the pizza was 23 cm. Topographic relief of the pizza, as revealed in cross-sectional profile was merely 13 mm (Fig. 1b). My delight as a structural geologist came upon observing that two pepperoni-sized circular depressions existed near the edge of the pizza in the northeast and northwest quadrants. There was not even a trace of cheese in these depressions, let alone pepperoni. Furthermore, opposite these depressions, in the southeast and southwest quadrants, two pieces of pepperoni overlapped in low-...
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