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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.
Youngest rock on the ocean floor can be seen in divergent plate boundaries and hot spots. Tectonic plates are moving continuously. When two plates diverge to each other volcanic material erupt in the boundry. This liquid magma cools down and become solid magmatic rock. Such areas are called divergent boundary. If these two boundries are beneath an ocean than cooling process become faster. Such areas are called seafloor spreading. Atlantic mid oceanic ridge is the longest divergent boundary. Iceland is formed because of this process! Hot spots are also host the youngest rocks on Earth. Hawaii Islands are the well known examples of hot spots.