As magma gets closer to the surface and cools, it begins to crystallize minerals like olivine and form bubbles of volcanic gases.
(magma; gets; closer to the surface and cools) (it; begins; T:As magma gets closer to the surface and cools) (it; to crystallize; minerals like olivine and form bubbles of volcanic gases)
magma it it
gets begins to crystallize
closer to the surface and cools
T:As magma gets closer to the surface and cools
minerals like olivine and form bubbles of volcanic gases