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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.
Magma is highly heated molten rock that comes to the surface of  usually through volcanic eruption. Magma is usually found beneath  the earth located near the earth's core a â¦ nd can sometimes contain  crystals and gases.Answered.agma is highly heated molten rock that comes to the surface of  usually through volcanic eruption. Magma is usually found beneath  the earth located near the earth's core a â¦ nd can sometimes contain  crystals and gases. Answered.