wat
There's tons of evidencing pointing to the validity of the theory of evolution. Don't tell me you're one of the people who dismiss it purely on it being a theory and not a law or something to that effect? The evidence is overwhelming, while proof for creationism is pretty much nonexistent. That's why it's called faith, belief in something in the absence of proof.
I'm fairly certain that the Mayans knew well enough that when a calender ends, you just start a new one.
Secondly, the earth is a planet and cannot go extinct. It can cease to allow life to function and/or be destroyed.
Of course there are such things as dinosaurs, it's like saying "mammal" or "reptile".
And you really think sharks are less than 500 years old as as species? Sharks have remained fairly untouched for ages, they're pretty much always been perfect killing machines.