The compositions of basalt and rhyolite differ in the amount of silica. Basalt typically contains percent silica, while rhyolite contains about percent silica.

Basalt contains about 45% of silica content, and

Rhyolite contains more than about 65% of silica content

Explanation:

Basalt is an extrusive igneous rock that is formed mostly from the eruption of volcanoes and due to the seafloor spreading at the mid-oceanic ridge. This rock is formed due to the rapid cooling of magma at the surface of the earth. It is comprised of about 45% of silica content.

On the other hand, Rhyolite is also an extrusive igneous rock that is formed from the volcanic eruptions at the continental areas. These are also formed due to the solidification of magma at the surface at a higher rate. It is comprised of more than about 65% of silica content.

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