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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.
In Mammoth Cave Kentucky youâll discover the worldâs longest known cave system. More than 350 miles of the vast chambers and winding rock tunnels and trails have been explored in Mammoth Cave and countless more remain untouched. Discover the beauty and mystery of the cave for yourself on one of 15 guided tours ranging from 30 minutes to five hours. Outside Mammoth Cave thereâs fun for kids of all ages! Nature lovers will enjoy camping, hiking, horseback riding and rock climbing. A newly installed zip line takes visitors through the treetops at speeds up to 30 miles an hour.