I would consider an act of god (if one did exist) completely supernatural, effortless and significant enough (ie. turning mount everest upside down in the blink of an eye and having it rest on it's tip) not pleading and begging a pharaoh to let 'his people' go or else his 'god' will unleash 10 plagues all of which can be deduced by science and have been explained over and over and over. Some people just don't get it 
And you fit right on the list of those who don't get it. There was no "begging" involved. Pharoah was going to release Israel, ONE WAY OR THE OTHER. The easy way: He lets them go, with minimal damage to himself and and his kingdom.
The hard way: Well, we all know how tha went.
Plus, your so-called deductions don't quite cut the mustard. Why exactly would mere natural phenomenom make Pharoah release the Israelites? I mentioned this to BayGBM some time ago. There's a scene in
The Ten Commandments in which Rameses screams at Moses and the Egyptian priests, claiming a a report of a mountain spewing red mud came to him, claiming that was the reason for the disasters. Of course, a few more plagues later, his priests were still pleading with Pharoah to let Israel go.
Of course, the back-breaker was the slaying of the firstborn, including his own son.
So, for 400 years, Israel's been in bondage. Yet they only get released once Egypt get hit with a slew of natural disasters, which just so happened to hit WHEN Moses says, WHERE Moses says, HOW Moses says, for as long as Moses says. And, Israel goes free, without lifting a single sword in combat and with Egypt's loot.
Of course, folks like you claimed that the Exodus never happened at all. So, your quip about science deducing wht happened with the plagues just make your claim look silly.