How can CSI tell from a skull the race of the person?

Just curious. When a skeleton is found in the woods the police can ususally identify the race. How is that possible? Don't all skulls look pretty much alike?

I think it is by the bone structure.

They use craniofacial anthropometry, since people's faces between race look different, it makes sense that their skulls would also look different. For example, asians would have higher cheek bones, or someone of african decent might have a longer head.

From the ratio of anteropsterior&transverse diameters (most important), and the structure of the lower jaw&how it fits with the whole of the skull (like if it protrudes out).