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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.
Mammoth cave system is the largest or longest natural cave system in the world as well as in North America or USA. Situated in Kentucky, USA, this longest cave having 567 km of length.It is centered around the Green River, with a tributary and with 145 miles of passageways.lso it is regarded as the biggest or largest cave in Europe or EU. Jewel Cave it is the third longest cave in the world, with 108 miles of mapped passageways. It is located in South Dakotaâs Black Hills (USA). Jewel cave is open year round.