Here's a breakdown of why:

* Gravity: The driving force behind landslides. Gravity pulls the rock and soil downhill.

* Slope: The inclined surface where the movement occurs.

* Huge amount of rock or soil: Indicates the significant volume of material involved, which is a characteristic of landslides.

Landslides are a common and sometimes dangerous natural phenomenon. They can be triggered by various factors, including heavy rainfall, earthquakes, volcanic eruptions, and human activities like deforestation and construction.