Earth Formed from Melted Asteroids - Universe Today
Many of the Earth's volcanic rocks might have come from melted asteroids, according to researchers from the UK's Open University. The scientists have discovered that many early asteroids were quite volcanic and would have had large magma oceans. These asteroids would have become layered with lighter rock forming near the surface while denser rocks were deeper inside. The Earth probably grew from the accumulation of these melted asteroids.