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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.
while a less intensive kind of diving called cavern diving does not take divers beyond the reach of natural light and typically no deeper than 100 ft and penetration not further than 200 ft true cave diving can involve penetrations of many thousands of feet well beyond the reach of sunlight