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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.
With the necessary gear and equipment, this tour opens the gates to an almost surreal volcanic realm. All you need is the willingness to do a moderate 45â50 minute hike (in order to get to the crater) and the guts to descend 120 metres (400 feet) to the bottom of the volcano's magma chamber in an open cable lift. 39 000 ISK per adult. Minimum age 12 years old.