Long Riddles and Answers

Question: Everything is what it is not, but everything is not what it is. So what is everything?

Question: You wait for it. It appears, cracks, stays for a moment, then disappears before your eyes.

Question: What goes black when you buy it, red when you use it, and goes white when you throw it away?

Question: Made of ten but two we are havoc 5 and we are weak but all together but small we are strong.

Question: A man walks all the way around the world without getting wet.

How does he do this?