Why not all the rocks follow the same path in the rock

All the rocks not follow the same path in the rock cycle because of various types.

Explanation:      

All the rocks are not same, there have various types and classes. Three broad categories are, sedimentary, which is completely made up of sand, shells, pebbles and fragments of other materials. As time passes by it gets deposited over and over, gets harden. Second one is metamorphic, this one is formed under the surface earth due to heavy pressure and intense heat. Last one is igneous, which is formed when the molten magma cools and hardens after the volcanic eruption. In this way all rocks do not follow same kind of cycle for formation.

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