Answer the following question given this paragraph: 

Cleavage is the tendency of a mineral to break along certain planes. When a mineral breaks along a plane it makes a smooth surface. Minerals with different crystal structures will break or cleave in different ways, as in Figure below . Halite tends to form cubes with smooth surfaces. Mica tends to form sheets. Fluorite can form octahedrons.


Q: What term means the tendency of a mineral to break along certain planes?

 Choices:

- cavity

- fault

- fracture

- cleavage

A:
cleavage
