The crust of continents, known as continental crust, is much thicker than the crust beneath the oceans (oceanic crust). Here's a breakdown:

* Continental Crust:

* Average thickness: 35 kilometers (22 miles)

* Range: 25-70 kilometers (15-43 miles)

* Composed primarily of granite and other less dense igneous rocks.

* Oceanic Crust:

* Average thickness: 7 kilometers (4 miles)

* Range: 5-10 kilometers (3-6 miles)

* Composed mainly of basalt and gabbro, denser rocks than those found in continental crust.

It's important to note that the thickness of the crust can vary significantly depending on location and geological features. For example, mountain ranges have much thicker crust than plains.