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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.
Nonconformity. When igneous or metamorphic rocks are eroded and then covered by younger sedimentary rocks, the contact is called a nonconformity. One of the most famous of these is found in the Grand Canyon, where the oldest sedimentary rocks are more than a billion years younger than the 1.6 billion-year-old metamorphic rocks on which they rest.