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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.
When melted rock or magma cooled and solidified, then it is known as igneous rocks. Sedimentary rocks are formed when sediments get solidified. Metamorphic rocks are rocks that have changed from igneous rocks or metamorphic rocks. Like water cycle, there exist rock cycle (geological cycle) in geology.sually metamorphic rocks are formed deep in the earth. Heat comes from magma, while pressure comes from the layer of rocks on top of the other layers. Metamorphic rocks are classified based on foliation as foliated rocks and non-foliated rocks. Foliation means the existence of series of parallel surface.