Concept:The ejection of magma and related materials from inside the Earth onto the surface is called vulcanicity.
Explanation:Vulcanicity includes volcanic eruptions, lava flows, and the release of ash and gases.
This process brings molten rock, or magma, from deep below the Earth to the surface.
Sedimentation is the settling of particles, not magma ejection.
Folding refers to the bending of rock layers under pressure.
Metamorphism is the change of rocks due to heat and pressure.
Only vulcanicity directly matches the process described in the question.
Answer:D. Vulcanicity