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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.
Extrusive rocks are so named because they are the result of magma pouring onto the surface of the planet and cooling. When it reaches the surface, either on a continental shelf as a volcano or on the ocean floor as a submarine volcano, it becomes lava, by definition.