A scuba diver descends from the water's surface to a depth of 60 feet. Which of the following are well-defined changing quantities in this situation? There may be more than one correct answer.
A. The distance traveled by the diver after leaving the surface
B. The final depth to which the scuba diver descended
C. The distance from the scuba diver to the ocean floor
D. The time it took for the diver to reach a depth of 60 ft
E. The scuba diver descending
F. Distance
G. The amount of time since the scuba diver left the water's surface