http://www.abovetopsecret.com/The Plagues happened at the same time as a massive volcano eruption. The volcano Santorini sent ash in to the air effecting the surrounding area. The ash is found in Cairo and the Nile River, proven by testing the composition of the ash. This volcanic eruption happened between 1500-1650BC while the Plagues happened between 1400-1550BC. So it fits there.
1st Plague. River ran red LIKE blood. But there is a common algae plume called the Red Tide. This makes the river, or any water, look red like blood. Why did this happen? The ash changes the PH level of the river allowing the algae to bloom.
2nd Plague. Frogs. The algae is killing fish. Fish eat frog eggs. No fish, record number of frogs. Frogs can't live in polluted water and so leave the river.
3rd and 4th Plague. Lice and flies. The translation can actually be lice, fleas, gnats, or midges. But you have riverfull of dead fish, and now dead frogs. This brings the insects of the 3rd and 4th Plague.
5th Plague. Pestilence. Flies, dead frogs, dead fish, easy enough, no?
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