12. A reflection seismic record in an area of relatively flat dips gave the following data: Distance shot-point to detector [m] Travel-time (t,), 1st reflection [s] Travel-time (t,), 2nd reflection [s] 1.200 1.201 1.000 30 90 150 210 270 1.002 1.003 1.201 1.202 1.203 1.205 1.207 1.007 1.011 1.017 330 390 1.023 (a) Plot the t-x curves for these reflections to show the "moveout" effect. (b) On a different graph, plot the 2-x2 curves (i.e., squared data) for the reflections. (c) Determine the average vertical velocity from the surface to each reflecting bed. (d) Use these velocities to compute the depths to the reflecting beds.