http://u.youku.com/user_video/id_UNTk5NTg4ODg=_order_1_type_1_page_2.html

The best video series of earth science I have ever found online. As various open class of prestigious universities have been put online for sharing, seldom can we found any valuable earth science related ones except for some talking about climate change. So far, basic courses such as geology, geography, hydrology are still not available. As for this edition of earth science, the professor gave a general idea about the birth, evolution, functionality, internal reaction,surface cycle and position in galaxy of earth. I went through the first 20,omit the middle 20 episodes which mainly focus on earth chemistry or so, and finished the last 10 about water cycle and human-earth relationships. The courses are vivid, simple, concise, fundamental and inspiring  and I ‘d like to recommend them to whoever have the interest to watch.