It is made mostly from red sandstone.
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High quality uniform is made up of the cotton material.
Chromosomes are long, wound up strands of the genetic material, DNA.
because a semicoductor only alows curent to flow in one direction
yoke is made up of cast iron. if you're talking about inner compartment where the windings stay, then it is made up of silicon steel for max magnetic field distribution
Microphones have been made from various materials. The diaphragm used to pick up the sound is thin metal. The magnet to convert the sound into electrical signals is sometimes metal sometimes a special material. The case of the microphone may be plastic or metal