Magma

Magma is molten rock beneath the surface of a planet or large moon.

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 USS Enterprise (NCC-1701-D) was able to reverse the process by injecting plasma into pockets within the planet's magma layer. 

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Magma