A set of diagrams. The bottom is labeled Age in years. A log underground with many arrows representing movement from the log to aboveground, at 100 percent; Age is 0 years. A log underground with fewer arrows representing movement from the log to aboveground, at 50 percent; Age is 5,730 years. A log underground with four arrows representing movement from the log to aboveground, at 25 percent; Age is 11,460 years. A log underground with two arrows representing movement from the log to aboveground, at 12.5percent; Age is 17,190 years. Which statements describe the image? Check all that apply.