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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.
This creates a volcano. When the magma cools it turns into solid rock, called extrusive igneous rock. Magma that cools underground forms solid rock called intrusive igneous rock. Areas of rock can move slowly upwards, pushed up by pressure of the rocks forming underneath. This is called uplift.Weathering breaks down rocks on the surface of the Earth.agma that cools underground forms solid rock called intrusive igneous rock. Areas of rock can move slowly upwards, pushed up by pressure of the rocks forming underneath. This is called uplift. Weathering breaks down rocks on the surface of the Earth.