<P> Some historians have suggested that the plagues are passed - down accounts of several natural disasters, some disconnected, others playing part of a chain reaction . Natural explanations have been suggested for most of the phenomena: </P> <Ul> <Li> Plague 1--water turned into blood; fish died <Ul> <Li> Dr. Stephen Pflugmacher, a biologist at the Leibniz Institute for Water Ecology and Inland Fisheries in Berlin believes that rising temperatures could have turned the Nile into a slow - moving, muddy watercourse--conditions favorable for the spread of toxic fresh water algae . As the alga Planktothrix rubescens dies, it turns the water red in a phenomenon known as "Burgundy Blood". </Li> <Li> Alternatively, a bloody appearance could be due to an environmental change, such as a drought, which could have contributed to the spread of the Chromatiaceae bacteria which thrive in stagnant, oxygen - deprived water . </Li> </Ul> </Li> <Li> Plague 2--frogs <Ul> <Li> Any blight on the water that killed fish also would have caused frogs to leave the river and probably die . </Li> </Ul> </Li> <Li> Plagues 3 and 4--biting insects and wild animals <Ul> <Li> The lack of frogs in the river would have let insect populations, normally kept in check by the frogs, to increase massively . The rotting corpses of fish and frogs would have attracted significantly more insects to the areas near the Nile . </Li> </Ul> </Li> <Li> Plagues 5 and 6--livestock disease and boils <Ul> <Li> There are biting flies in the region which transmit livestock diseases; a sudden increase in their number could spark epizootics . </Li> </Ul> </Li> <Li> Plague 7--fiery hail <Ul> <Li> Volcanic eruption, resulting in showers of rock and fire . </Li> </Ul> </Li> <Li> Plague 8--locusts <Ul> <Li> According to the United Nations Food and Agricultural Organization, when they get hungry, a one - ton horde of locusts can eat the same amount of food in one day as 2,500 humans can . </Li> </Ul> </Li> <Li> Plague 9--darkness <Ul> <Li> The immediate cause of this plague is theorized to be the "hamsin", a south or southwest wind charged with sand and dust, which blows about the spring equinox and at times produces darkness rivaling that of the worst London fogs . </Li> </Ul> </Li> <Li> Plague 10--death of the firstborn <Ul> <Li> If the last plague indeed selectively tended to affect the firstborn, it could be due to food polluted during the time of darkness, either by locusts or by the black mold Cladosporium . When people emerged after the darkness, the firstborn would be given priority, as was usual, and would consequently be more likely to be affected by any toxin or disease carried by the food . Meanwhile, the Israelites ate food prepared and eaten very quickly which would have made it less likely to be contaminated . However, this does not explain how the firstborn cattle alone also would have perished . </Li> </Ul> </Li> </Ul> <Li> Plague 1--water turned into blood; fish died <Ul> <Li> Dr. Stephen Pflugmacher, a biologist at the Leibniz Institute for Water Ecology and Inland Fisheries in Berlin believes that rising temperatures could have turned the Nile into a slow - moving, muddy watercourse--conditions favorable for the spread of toxic fresh water algae . As the alga Planktothrix rubescens dies, it turns the water red in a phenomenon known as "Burgundy Blood". </Li> <Li> Alternatively, a bloody appearance could be due to an environmental change, such as a drought, which could have contributed to the spread of the Chromatiaceae bacteria which thrive in stagnant, oxygen - deprived water . </Li> </Ul> </Li> <Ul> <Li> Dr. Stephen Pflugmacher, a biologist at the Leibniz Institute for Water Ecology and Inland Fisheries in Berlin believes that rising temperatures could have turned the Nile into a slow - moving, muddy watercourse--conditions favorable for the spread of toxic fresh water algae . As the alga Planktothrix rubescens dies, it turns the water red in a phenomenon known as "Burgundy Blood". </Li> <Li> Alternatively, a bloody appearance could be due to an environmental change, such as a drought, which could have contributed to the spread of the Chromatiaceae bacteria which thrive in stagnant, oxygen - deprived water . </Li> </Ul>

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