der Q3: A) Give one reason for the following (choose 5 only): 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. (10 M)