Because if events are correlated then that means there are more factors than just cause and effect, however, in a cause and effect relationship there is one part leading to another and then the cycle just continues of one leading to another, there is usually not an end in a cause and effect relationship because that one cause could lead to multiple causes and multiple effects.
A correlation between<span> variables, however, does not automatically mean that the change in one variable is the </span>cause<span> of the change in the values of the other variable.</span>Causation<span> indicates that one event is the result of the occurrence of the other event; i.e. there is a causal relationship </span>between<span> the two events</span>