The ten plagues where supposed to be for the king of Egypt because he had the Israelits as his slaves and didn't let them free. Then God got angry and sent the 10 plagues to Egypt and one of those plagues were frogs. The frogs attacked all of Egypt.
A white fog killed every first born child in Egypt except those who had blood in the front of their house so they are safe and no one dies.
God told Noah to part the red sea and he did so him and the Israelites could get across to the Promise Land and start a new civilization.