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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.
Combined with the smaller chamber, they now form the largest known magma reservoir in the world. Counter to most people's belief, the magma chamber is not full of liquid molten rock. Instead, the rock is hot, mostly solid and sponge-like, with pockets of molten rock within it.ombined with the smaller chamber, they now form the largest known magma reservoir in the world. Counter to most people's belief, the magma chamber is not full of liquid molten rock. Instead, the rock is hot, mostly solid and sponge-like, with pockets of molten rock within it.