The answer is atrial depolarization. The P wave of a normal electrocardiogram specifies atrial depolarization. In addition, depolarization happens in the four compartments of the heart which is both atria first and in both ventricles. The sinoatrial or as called as SA node on the wall of the right atrium starts depolarization in the right and left atria that can cause the contraction in which it is symbolized by the P wave on an electrocardiogram.
All the emissions go in to the atmosphere and that causes the ozone layer to open up more and let radiation in. the effects are that they pollute the wild life around it and the people that have to dig it up destroy the natural habitat
