* The crust is the cookie's outer layer.

* The continental plates are the thick, chewy chocolate chip parts. They're made of rocks like granite, which are lighter and less dense.

* The oceanic plates are the thinner, crispier wafer parts. They're made of rocks like basalt, which are heavier and denser.

Think about it like this:

* Chocolate chips are light and fluffy, making them less dense.

* Wafer cookies are thin and crunchy, making them denser.

So, the continental plates are like the chocolate chips, and the oceanic plates are like the wafers! The continental plates are less dense because they're made of lighter rocks.