Give one reason for the following 1) Both amorphous and crystalline materials exbibit different plastic deformation mechanisms. 2) Metals are considered denser than ceramics and polymers. 3) Water possesses high boiling temperature than HF (100 C vs. 19.4 C). 4) At 1394 C the Fe can be found in FCC crystal structure called y-Iron. 5) The crystal structure of gem stone has nearly a regular geometric shape and flat faces. 6) The grain boundaries formed within solid crystal structure