Gravity has a impact in the tides because of the moons gravational pull
Wind, it takes nothing to use wind, which means it doesn't put harmful emissions into the atmosphere.
The difference between the two mentioned magnitudes is 4.
A magnitude 1 earth-quack is 10000 times bigger than a magnitude -3 earth-quack. On the other hand, it is 1000000 times stronger in terms of energy release.
Note: To calculate the difference in energy between two earth-quacks, first you calculate the difference between their magnitudes and then you raise 10 to the output you obtain.
Well there are many different answers to this question and I am not sure what the answers is.
