Here's why:

* Abundance: Basalt is the most abundant type of volcanic rock found on Earth's surface. It's formed from the cooling and solidification of lava flows.

* Formation: Basalt originates from the mantle, making it a common component of oceanic crust and volcanic island chains.

* Composition: It's typically dark-colored and rich in magnesium and iron.

While other extrusive igneous rocks like rhyolite and andesite are also significant, basalt stands out due to its prevalence and wide distribution across the globe.