Why do geophysicists get paid more on average than do engineers? Thank you.?

I thought engineering was more rigorous and complicated, therefore should lead to a higher pay in turn.Geophysicists occupational group earned from $15.27 to $117.79 an hour. The average wage was $55.99 an hour. Engineers occupational group earned from $16.83 to $85.00 an hour. The average wage was $42.63 an hour.