Noah and his family were the only people on Earth who were doing right.
So God caused a flood that killed everybody in 40 days and 40 nights.
All of the people on Earth were evil, it was a time that was dark.
Noah and his family were spared when God told them to build an ark.

God told Noah to take to of every animal so that all species would survive.
When the flood was over, Noah and his family were the only people who were alive.
It probably wasn't an easy decision when God decided to kill all of those women and men.
He gave us the rainbow which is a promise that he'll never do it again.