Death of the first-born child: It could have been due to God, or it could have been due to the fact that the eldest child gets the largest rations at dinner. Maybe the food had turned bad.
Swarms of locust: Again, it could have been God's work, or maybe there was a sudden break in the ecosystem through some elegant shift in nature that caused locusts to swarm through the desert in monstrous swarms.
Agreed. But you have to take the whole chain of events into consideration. i.e. All 10 plagues.
1) Nile turns to blood: Toxic algal bloom, similar to what we know as red tide. Physteria literally dissolves still living fish.
2) Plague of frogs: No fish means nothing to eat frog spawn. Leads to overpopulation. The toxins in the water force the frogs (and toads) away from the river.
3) Plague of lice: Egyptians referred to over 100 species of insect as "lice." With the frogs and other amphibians carrying the toxins out of the water, they die quickly, leading to a reduced number of natural predators for insects.
4) Plague of flies: Millions of dead fish and amphibians attract flies.
5) Livestock deaths: Most likely blue tongue for the cattle, and African horse sickness for the horses, both of which are spread by a particular louse.
6) Boils: Glanders, which is a bacterial infection spread by stable flies.
7) Hailstorm: A natural event. Even today there are hailstorms in the Middle East.
8) Swarms of locusts: Again, a natural occurrence.
9) Darkness: Sandstorms. Or an eclipse.
10) Death of the Firstborn: The grain was harvested after/during the swarms of locusts, so there was a significant amount of locust droppings on the harvested material. The grain was stored in a grain house, and covered in sand, making a hot and humid environment, perfect for the growth of bacteria and fungus. A mycotoxin grew on mold that developed on the grains.
In Egyptian culture, the firstborn get an extra helping at meals, which gave them, and only them, a lethal dose of the toxin.
But the thing that gets me is this: All this happened over a short period of time. It was so dramatic, that Egypt lost their slaves,, they even found chariots at the bottom of the sea.
The story is being re-told, so the timeline may have been condensed. But it probably did all take place within either one growing cycle, or one year.
As far as the chariots... not really. The Hebrew text was translated incorrectly (The Bible? Mistranslated? Get outta town. Get right outta town.) to Red Sea, when it should have been Sea of Reeds. As in the marshes that dot the delta of the Nile. Also, there is no hard evidence that anything resembling a chariot was found at the bottom of the Red Sea, and even if it was, there's nothing to make it certain that it was specifically from that particular event.