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Magma in Earth's Mantle Forms Deeper Than Once Thought. Study simulating pressures in mantle beneath the ocean floor shows that rocks can melt at depths up to 250 kilometers. When magma reaches Earth's surface and erupts from a volcano, it becomes lava.
The cave, now known as Son Doong Cave, or âthe cave of the mountain riverâ was far larger than anyone had ever imagined. The largest cavern stretched for over 5 km (about 3 miles), was 650 feet wide, and had walls that soared upwards over 200 m (656 feet), high enough to comfortably fit a modern day skyscraper. Son Doong Cave. That little speck with the light is a person.