C1 ) an earthquake of magnitude 6, when compared to an earthquake of magnitude 4, is how many times more energetic? a) 10 b) 30 c) 100 d) 900

c) 100

Explanation:

The energy of an earthquake is giben by the following formula:

In which log is the logarithm operation and M is the magnitude.

We can isolate E elevating both sides to 10, which leaves us with on the left side. This is a logarithm property So:

Magnitude 6

Has a energy of

Magnitude 4

Has a energy of

So the earthquake of magnitude 6 is times more energetic.