Science Buddies: "Ask an Expert"

Hi.
Lately I find the exact forum. I have some questions.
1) Why there are different seasons on the earth due to its tilt ?
2) Why some part of the moon always remain unseen from earth ?

Hi,

These sound like homework questions and not science fair questions. Science Buddies is designed to help students with science fair projects. I suggest putting your questions into your favorite search engine; both answers should be pretty easy to find with a quick Google (or other) search.