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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. The Mammoth Cave System is without a doubt the worldâs greatest subterranean wonder. Located in an area thatâs roughly only a few miles in diameter, the cave twists and turns and stretches to a length of some 400 miles and a depth of 30 stories, and thatâs only the explored tunnels. Itâs suspected hundreds of miles of cave remain to be discovered.