The solid form of a magma body is called igneous rock.

Here's why:

* Magma: Molten rock found beneath the Earth's surface.

* Cooling and Solidification: When magma cools and solidifies, it transforms into igneous rock. This process can happen either slowly underground (intrusive igneous rocks) or rapidly above ground (extrusive igneous rocks).

So, the solid form of a magma body isn't a separate term; it's simply the resulting igneous rock that forms after the magma cools and solidifies.