How much more destructive energy does an earthquake of magnitude 7 has in comparison to an earthquake of magnitude 5?
10
100
10000
1000
An earthquake of magnitude 2 on Richter scale is:
(a) two times as strong as an earthquake of magnitude 1
(b) four times as strong as an earthquake of magnitude 1
(c) ten times as strong as an earthquake of magnitude 1
(d) hundred times as strong as an earthquake of magnitude 1