Density of Basalt: 2.7-3.0 g/cm³

Density of Rhyolite: 2.4-2.6 g/cm³

Explanation:

* Basalt is a mafic igneous rock, meaning it is rich in magnesium and iron. These minerals have relatively high densities.

* Rhyolite is a felsic igneous rock, meaning it is rich in silica and aluminum. These minerals have lower densities than those found in basalt.

Therefore, due to its higher silica content and lower iron and magnesium content, rhyolite has a lower density than basalt.