Name:_________________________________

1) Describe the difference between nuclear fission and nuclear fusion. (5 pts)

2) As a star grows older, it has less hydrogen in its core, why? What did that hydrogen become? [Hint which of the processes you just defined is at work, and what does that process do?] (10 pts).

3) When we discussed the age of the Earth (and that of the solar system) we used the process of nuclear decay to arrive at the correct answer. Describe the process of nuclear decay. Given an example of what you might start with, and what you end-up with? How is this process used to find an age? (10 pts)