Landslide, debris flow, creep, rock falls, avalanches … There are many terms that deal with moving material downwards the slope. Landslides are triggered by nature or/and human impact. Engineers try to calculate slope stability to protect us and our infrastructure. Therefore, it is important to understand the math behind, but this will be covered later in your syllabus. However, this is all physics. So, let me ask you the following question.