The core has the highest density among the Earth's crust, mantle, and core.

Here's a breakdown of their densities:

* Crust: 2.7 - 3.0 g/cm³

* Mantle: 3.3 - 5.7 g/cm³

* Core: 9.9 - 13.0 g/cm³ (outer core) and 12.6 - 13.0 g/cm³ (inner core)

The high density of the core is due to its composition of iron and nickel, which are very dense elements.