Since it doesn't say the flood was worldwide, that won't help you, either.
Nope "world" is "tevel"; "land" is "erets." If it was worldwide, the text would have said so. You've been misled here.
By old earthers when they stated it takes millions of years for diamonds, rubies, coal and oil to form.
See above. Scientists have realized for over a hundred years, there are quick ways to make those things. You can speed up the process by various methods not seen in nature. You were misled by young earthers who told you those things couldn't be artificially done faster.
Science never "proves" anything in the true sense.
Which means false claims can be scientific.
They are called "hypotheses." Hypotheses can be either true or false. They are testable predictions about some phenomenon, like evolution or gravity. When they are repeatedly confirmed by evidence, they are considered true, and become theories. Just like you know that the Sun will rise tomorrow, we know theories are correct, even if they can't be logically proven. Most everything you know is like that.
Evolution is a fact. It's a fact because it's directly observed. Theories aren't facts; they are explanations for facts that have been repeatedly confirmed by evidence. I suspect you've confused the observed phenomenon of evolution, with a consequence of evolution (common descent). You should probably know that most creationist organizations now accept the theory in a limited way, usually admitting common descent for species, genera, and families. Sometimes more.