Which of the following are you most likely to find in the earths crust: The silicates feldspar and quartz or the non-silicates copper and iron?
The silicates are the more common on the earth's crust.
Sand Sand stone, are silicates. Granite is made of silicate feldspar and quartz. Granite is a major component of the continental crust.
copper and iron ores and compounds are relatively rare and therefore valuable.