At oceanic hot spots (mantle plumes), mafic magma erupts at the surface and solidifies to form basalt.
Basalt is a dark-colored, powdery, igneous rock mainly made of plagioclase and pyroxene minerals.
It most usually structured as an extrusive rock, like as a lava flow, but can also shape in small intrusive bodies, such as an igneous bank or a thin sill.
Basalt basically more of Earth's surface than any other rock type. Most areas within Earth's ocean basins are braced by basalt.
Although basalt is much less common on continents, lava flows and flood basalts basically several percent of Earth's land surface. Basalt is a very dominant rock.
Basalt is an elated extrusive igneous rock formed from the quick cooling of low-viscosity lava rich in magnesium and iron exhibit at or very near the surface of a rocky planet or moon. More than 90% of all volcanic pebble on Earth is basalt.
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