in an area where a river has cut deep into earth, there are several layers of very different rock exposed. the oldest rock layer is most likely to be the layer that is

Which of the following comparisons is true? a: high school tests generally cover more material than college exams. b: your college curriculum is more fixed and standardized than your high school curriculum. c: you get more personal attention in class from your college professors than from your high school teachers. d: college professors usually don't review test material in class the way high school teachers do.