Given the question: Process:  - Magma comes up to the surface of the earth - The magma cools - Particles inside the magma move closer together - Crystals are formed - The crystals contain minerals.  Perturbation hypothesis: suppose there is more volcanic activity under the oceans happens, how will it affect more magma will cool.  Does the supposed perturbation have an effect (direct or indirect) on the process?
The answer is: