Question

Question 43 (2 points) Saved 500 km 100 km O If a 500-km wide, 30-km-thick band of continental crust is compressed and thickened, resulting in a total width of 100 km, how thick would the resulting mountain belt be if the total volume (or in this 2-D problem, cross-sectional area) of crust stays the same? 5 km 0 30 km 100 km 150 km Question 44 (2 points) What would be the topographic elevation of this mountain belt (again assuming constant volume of crust)? a) The height of the mountains is the answer to the previous problem minus the old thickness (30 km). Ob) The height of the mountains is the answer to the previous problem minus sea level (0 km). Oc) The height of the mountains is much smaller than either a) or b) because isostatic forces sink most of the thickness, deepening the crustal root. O d) The height of the mountains is much larger than either a) or b) because isostatic forces uplift the mountain belt. Question 45 (1 point) Which process would NOT likely affect the actual thickness of the crust in the Alps during compression and shortening from 500 km to 100 km? Ostrike-slip faulting erosion delamination O volcanism

Answer 1

43). Answer- As I the first case the thickness is 30km and width is 500km which when çompressed it decreases to its 5times less width that is 100km, so the thickness will be increased by 5 time, so

(30*5)= 150km thickness

44).Answer- a. It is because as the isostasy is the main factor it balances the height through isostatic compensation and the hight it already had will be subratcted from the new thickness.

45). a. Strike slip faulting, which is not going to affect the actual thickness of the crust anyway.