Geologists have discovered the likely cause of the Devonian extinction: major volcanism as revealed by a giant peak in the presence of mercury in the environment at that time.
The article does not say specifically that most of our mercury comes from volcanic activity. It is only a conclusion that I have drawn. I would like to find a good book about other results of volcanic activity. I understand what causes a volcano to erupt but what happens afterward? What does the eruption contribute to the environment? I think there was much more volcanic action in the planet's ancient history than there is today. How did that help form the planet?
Does anyone know of such a book? Thank you.