Here's why:

* Earth's density: 5.52 g/cm³

* Other planets' densities:

* Mercury: 5.43 g/cm³

* Venus: 5.24 g/cm³

* Mars: 3.93 g/cm³

* Jupiter: 1.33 g/cm³

* Saturn: 0.69 g/cm³

* Uranus: 1.27 g/cm³

* Neptune: 1.64 g/cm³

Earth's high density is due to its composition, which includes a large, dense iron core.