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Best Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.est Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.
A term that is sometimes used for oceanic crust rocks is sima, which is short for magnesium silicate, a common component of these rocks. Another term for these undersea igneous rocks is mafic, which comes from the fact that they are high in magnesium and iron.Basalt and gabbro are examples of mafic rocks.t's thinner, denser, and simpler in structure than the continental crust. Oceanic crust is also younger, on average; from its birth at a mid-ocean ridge to its end at a subduction zone is no more than 250 million years.