The 3 main constituents i would say are the Processor, Ram and the Mother board. With out the processor you computer would not be able to run any programs at all. The mother board connects all of the...
Main constituent of igneous rocks are
Plagioclase: the white or chalky looking grain is the common feldspar, plagioclase.
Quartz: the dark gray, glassy grain is quartz.
Orthoclase: the slightly...