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As populations transition from rural to urban living, many social changes take place. For example, as people move to urban environments, they tend to live in closer proximity to each other. This presents problems when it comes to sanitation and hiegiene.
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The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.
The Richter scale is used, from 0.1 to 9.0 magnitude. The Richter scale is determined from the logarithm of the amplitude of waves recorded by seismographs.
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There are 37 time zones in place today