Which did you include in your answer?

The Richter scale increases by powers of 10: each increase of 1 means 10 times the intensity. A change from magnitude 5 to magnitude 8 is 3 units, so the intensity ratio is 10³ = 1,000. Thus, the statement that magnitude 8 is 1,000 times more intense is correct, as is the calculation comparing 10⁸ with 10⁵ and the explanation using three scale increases.

AI-written and checked against the verified answer.