Lava, or magma, is usually formed when the middle mantle, at a depth of 250-406 miles, is hot enough to melt. This melted middle mantle is buoyant, and can rise through the upper layers of the earth.
The liquid outer core is between 2,890 to 5,150 kilometers below the earth’s crust. Lava, however, is molten rock above the earth’s surface while magma is molten rock below. So lava cannot technically be any deeper than the surface. Areas prone to volcanic activity have magma as shallow depths.
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