So the frequency is f =10 cycles / 120 s = 0.0833 cycles/s. Answer: D. Frequency refers to the number of occurrences of a periodic event per time and is measured in cycles/second. In this case, there are 10 cycles per 2 minutes (also known as 10 cycles per 120 seconds).
From the scientific viewpoint, the Earth would have had to form about 4.54 billion years since the earliest material in the solar system is dated back to about this time period.
Most physicists believe the earth is 4.5 billion years old. And the results of Terra, run with that assumption, works out OK. On the other hand, run the program assuming the earth is less than 10,000 years old, and that there was a catastrophic universal Flood, and all the geology works out OK that way also!