More Popular Riddles

Continuing our trend of presenting interesting riddles, here are some more riddles collected through multiple sources. Have a good time in chasing the solutions to these riddles. If you know the answers, you may wish to post them as comments to this thread.

1) Which is heavier..A pound of Aluminium or a a pound of sand?

2) There was an airplane crash. Every single person died, but two people survived. How is this possible?

3) You have read this exactly once and be sincere.
You are the driver of a bus. The bus starts from the depot at 4:00 A.M. in the morning. At the first stop, 4 passengers get into the bus. At the next stop, 3 people get in and 2 people get off. A break down happens at 10:00 A.M following which there is a delay in the journey. After recovery, at the next stop 2 people get off and 5 people get in. And at the next stop, 4 people get in. Question is, how many stops did the bus make?

4) A man builds a house with all four sides facing south. A bear walks past the house. What is the color of the bear?

5) You are in a cold room with only one match. There is a fireplace, a candle and an oil lamp. Which one do you light first?

6) A man bets another man that he can predict the score of a football match before even the game starts. The man agrees to the but loses. Why did he lose?

7) There are two bottles of water. One is at 15 degree celcius  and the other is at 15 degree Fahrenheit. A boy gets near to these two bottles and drops a coin into each of these bottles. The question is, in which bottle would the coin hit the botton soon and why?