Basalt is the primary rock type that constitutes the oceanic crust and forms the bulk of shield volcanoes. It is a dark, fine-grained igneous rock formed from the rapid cooling of low-silica (basic) lava. Basalt is the most common volcanic ...
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Basalt is the primary rock type that constitutes the oceanic crust and forms the bulk of shield volcanoes. It is a dark, fine-grained igneous rock formed from the rapid cooling of low-silica (basic) lava. Basalt is the most common volcanic ...