Thredbo Landslide Case Study & Natural Disasters | Grade 9-12 Geography General Information: This case-study presentation introduces major natural disaster types (cyclone, flood, tsunami, tornado, bushfire, landslide), then narrows to landslides and their forms and causes. It provides global examples (Brazil mudslide 2010, Montreal sinkhole) and then deeply examines the 1997 Thredbo landslide in Australia: location, tourism context, slide mechanism, scale (3,500 tonnes of debris), deaths, econom