My cultural studies is understanding of the earth. The next Wensday, I have a test that I must study this subject today. So I can’t go to the church today. In books, it explain about the landslide. I should know the difference between earth flow and debris flow and between mudflow and debris avalanche. The word ‘flow’ and ‘debris’ were confusing me. Oh my God!! Ha Ha…. I am really waiting the summer vacation!!! Ha Ha HA