Basalt: The Puzzling Stone
· Basalt is a mafic extrusive igneous rock formed from the rapid cooling of magnesiumrich and ironrich lava exposed at or very near the surface of a terrestrial planet or a moon. More than 90% of all volcanic rock on Earth is basalt. It is a finegrained substance with varying shades of color from grey to black. Basalt is an intergalactic rock as well with samples found on Earth's moon, Mars ...