8 random quickies

1.what gets hotter as it gets colder?
2.what is white when it's dirty turns black as you clean it?
3.what gets wetter as it dries?
4.how much wood could a woodchuck chuck if a woodchuck could chuck wood?(kind of random)
5.what gets bigger and never smaller?
6.how much money do you need to be rich?
7.what time is it when your clock is only right once a day?
8.what shape that can, be made from four matches, face any direction , be flipped any way and will stay right side up?

Answers: (will be updated)
1. aircond
2. blackboard
3. sponge, towel and anything that can absorb water
4.A woodchuck, or groundhog, is a cousin to the beaver and can if it decided to take a chunk out of a tree, like a beaver would, it would theroreticaly be able to fit 8 oz. of wood in it's mouth. So If a woodchuck could chuck wood he would chuck 8 oz. per bite.
5. universe, Pi, death, age anything you can think of.
6.
7.
8. Tetrahedral