Magma
Magma was molten rock, often found in the interior of worlds.

While serving aboard the  in 2365, Commander Kathryn Janeway sent an away mission to survey a volcanic moon. The shuttlecraft was damaged by a magma eruption, and three of the Billings crewmembers were severely injured. ()

In 2369, the Bajorans began a project to tap the molten core of Jeraddo for energy. From Deep Space 9, Jadzia Dax was able to monitor the moon's magma pressures. ()

In 2370, life on the planet Atrea IV was threatened by the solidification of its molten core. The  was able to reverse the process by injecting plasma into pockets within the planet's magma layer. ()

See also 
 Lava

External link 
 

de:Magma
Geology