Question

If a piece of sea floor has moved 50 km in 5 million years, what is the yearly

Answer 1

50 km in 5 million years = \[ \frac{50}{5\times 10^6}
\frac{\text{Km}}{\text{year}} =
\frac{50\times10^5}{5\times 10^6} \frac{\text{cm}}{\text{year}} =
1\frac{\text{cm}}{\text{year}}
\]