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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.
Cave trolls are found as deep as the center of the world, with lairs close enough to the subterranean magma to make a blockhead start to smoke from the heat. The lair consists of two ice torches and a nearby golden chest, although it's possible for only one ice torch to be present due to local stone formations.