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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.
AnsweA cave is a natural underground void large enough for a human to enter, while a cavern is a large cave that was formed chemically (through things like acid rain). Another mining definition for cavern can also be series of connected underground caves. This definition is the scientific term.he deepest point in Carlsbad Cavern, the park's tour cave, is 1037 feet below the surface, or 0.196 miles. However, this area is not open to the public. The deepest point the public visits is about 830 feet underground.