Conversation so far:
what is the parting of the red sea
The Crossing of the Red Sea is part of the biblical narrative of the Exodus, the escape of the Israelites, led by Moses.
What is the blood of the Nile River?
The sudden appearance of red-hued waters in the Nile could have been caused by a red algae bloom.
What is the rational behind the locusts in Exodus?
The volcanic eruption on Santorini may have created favorable conditions for the locusts: higher precipitations and higher humidity.
Why did the firstborn Egyptians die in Exodus?
The firstborn might have been the first to pick grain, and would have fallen victim to mycotoxin from the Nile River first.

Question: Where were the commandments from the book delivered?
Self-contained rewrite: Where were the Ten Commandments delivered?