Final answer:
Continental crust includes more kinds of rock than oceanic crust due to its formation, thickness, density, and age.
Step-by-step explanation:
The reason why continental crust includes more kinds of rock than oceanic crust is because it is formed in several ways. Continental crust is thicker and less dense than oceanic crust, allowing for the accumulation of different types of rocks. It is also younger than oceanic crust, which means there has been less time for the rock types to erode or be recycled. These factors contribute to the greater variety of rocks found in continental crust compared to oceanic crust.