Let us start with earthquakes. These happen when tectonic forces cause tectonic plates comprising the earth’s crust, to collide. This causes vibrations of varying magnitudes to be transferred from underground to the crust. If these forces have high magnitude, the effects of the earthquake will be severe as compared to low magnitude forces. An example of a severe earthquake is the one that hit Haiti in 2010, leading to a loss of close to 100 000 lives, and loss of property.