Earth's hot, melted rock, known as magma, rises from near the Earth's mantle.

Here's a breakdown:

* Mantle: The layer of Earth beneath the crust. It's mostly solid rock, but it behaves like a very viscous fluid over long periods.

* Convection Currents: Heat from the Earth's core causes convection currents within the mantle. This means hot, less dense magma rises, while cooler, denser magma sinks.

* Volcanoes: When this rising magma reaches the surface, it erupts as lava, forming volcanoes.

So, the next time you see a volcano, remember that the molten rock you're looking at came from deep within the Earth's mantle!