How does hot magma come to earth surface and what does it form

It comes y o the earth's surface by volcanic eruption and forms lava

If magma is more buoyant and less dense than surrounding rock, it rises through the Earths crust. A lot of magma is trapped in the crust, but some erupts right onto the surface of the Earth as lava. Magma forms igneous rock when it cools and crystalizes.

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