Gabbro is a coarse-grained rock with a mafic (MAFF-ick) composition. By name or number, indicate all of the following four statements that are likely true of a specimen of gabbro: 1) Minerals in the rock crystallized slowly 2) The rock likely has relatively high proportions of silica 3) Crystals in the rock are likely easily visible to the naked eye 4) Gabbro likely forms on the surface of the earth near volcanic activity