Here's why:

* Sudden Movement: Landslides are characterized by rapid downward movement of rock, soil, or debris.

* Block Material: The material involved can be a single large block or a collection of smaller pieces.

* Flat Inclined Surface: Landslides often occur on slopes, where gravity acts as the driving force.

Types of Landslides:

There are different types of landslides, including:

* Rockfalls: Free-falling rocks.

* Slumps: Blocks of earth that move downward and outward along a curved surface.

* Debris flows: Rapid movements of a mixture of rock, soil, and water.

* Earthflows: Slower movements of soil and rock.

Let me know if you'd like to learn more about a specific type of landslide!