Explore the critical topic of mass wasting in this introductory lecture. Delve into the reasons behind mass wasting events, examine the USGS Landslide Inventory, and focus on California landslides. Learn about landslide anatomy and various types of movement, including rock falls, erosion, slides, lateral spreads, and flows. Discover the triggers that cause these events and explore mitigation strategies. Understand the significant costs associated with landslides and analyze specific case studies such as the Ferguson Rock Slide, Happy Isles Rockfall, Laino landslides, and mining-related landslides. Gain a comprehensive understanding of Earth's hazards related to mass wasting in this informative 29-minute presentation.