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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 total length of all the halls of the cave is 210 kilometers. In addition, it is also the deepest cave in the continental United States. Lechuguilla Cave, opened in 1986, is located in the center of the study, conducted by the National Park cavers. The depth of 490m it is that makes it the deepest limestone cave in the United States.