The rate of deposition of different units in a basin may be calculated by looking at their times of deposition and thicknesses; the time when sediment shows when the basin began forming.

While viewing a topographic map, you notice a region in which the contour lines are very close together. what can you conclude about this region? a. it has a high population. b. it has a steep incline. c. it's near a political boundary. d. it contains a body of water.