A binomial distribution with n number of trials,and probability of success p can be approximated well by a normal distribution with mean np and variance 
if np > 5 and n(1-p)> 5.
Definitions:
S-waves
Secondary or shear waves, a type of elastic wave that moves through the body of the Earth, used in the study of earthquakes and the Earth's interior.
Oceanic Trench
Deep, underwater canyons formed by the subduction of one tectonic plate under another at convergent plate boundaries.
Magmatic Belt
A geographic zone that is extensively populated by igneous rocks which have been or are being formed by magmatic processes typically related to tectonic plate boundaries.
Passive Margin
The transition zone between oceanic and continental lithosphere that is not an active plate boundary.
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