There are various scientists who believe they can explain the occurrence of the ten plagues depicted in the book Exodus in the Bible, based on a singular natural event that caused a chain reaction of events.
According to Siro Igino Trevisanato it was caused by the Santorini volcanic eruption in Greece in 1602 B.C.
According to his theory, the ash from this massive eruption would have coated the Nile.
This would have been conducive for the growth of reddish freshwater algae known as Burgundy Blood algae that turns the water red when it dies. That would explain the first plague and this would have caused fish to die too.
With the fish dying, frogs would flee the water (second plague) and would end up dying too. Insects kept in check by frogs would rapidly increase and this would lead to the third plague.
This could explain the livestock diseases and the boils too, because the region is known to have biting flies and with nothing to control their numbers, it could have led to epidemics of associated diseases.
The hypothesis regarding the tenth plague is that the earth tremors caused by the eruption of Santorini allowed carbon dioxide and other toxic gases to escape the surface tension of the water in the Nile.
Being heavier than air, these gasses would "flood" the surrounding area displacing oxygen and killing those in their path. According to Simcha Jacobovici, the Egyptian firstborns slept on the ground and that would explain the tenth plague’s selectiveness.
