the breaking of a rock along a plane of weakness is called ____. a. specific gravity b. luster c. cleavage…

Answer:

C. cleavage

Brief Explanations:

Cleavage is the breakage of a mineral along smooth, flat surfaces. It occurs along planes of weakness in the crystal structure of the rock - forming minerals. Specific gravity is related to density, luster is about the way a mineral reflects light, and streak is the color of a mineral in powdered form.