Here's a breakdown of what makes a landslide:

* Sudden movement: The rock and soil move quickly and unexpectedly.

* Down a slope: Gravity is the main force driving the movement downhill.

* Mass of material: It involves a significant amount of rock, soil, or both.

Landslides can be caused by various factors, including:

* Heavy rainfall: Water saturates the soil, making it heavier and more prone to sliding.

* Earthquakes: Seismic vibrations can destabilize slopes.

* Volcanic eruptions: Ash and debris can create unstable slopes.

* Human activities: Construction, deforestation, and mining can all contribute to landslides.