Clean riddles for teens

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

One morning an airline president is leaving on a business trip and finds he left some paperwork at his office. He runs into his office to get it and the night watchman stops him and says, "Sir, don't get on the plane. I had a dream last night that the plane would crash and everyone would die!" The man takes his word and cancels his trip. Sure enough, the plane crashes and everyone dies. The next morning the man gives the watchman a $1,000 reward for saving his life and then fires him. Why did he fire the watchman that saved his life?

What starts with "w" and ends with "hat"?

What letter is a drink?

It has only two bones, but there are 1000s of ribs. What is that?

Two men are in a desert. They're both wearing backpacks. One of the men is dead. The man who is alive, has his pack open. The dead man's pack is closed. What is in their packs?

There is a word and six letters it contains. Take one away and twelve is what remains. What word is it?

What word becomes shorter when you add two letters to it?

It always becomes white when it becomes dirty. What is that?

What is it that you throw away the outer side, then cook the insides and then throw away the insides – what is the name of the item?