Which of the following are amorphous solids?

1. Iron
2. Glass
3. Plastic
4. Margarine
a. 1 c. 2 and 4
b. 1 and 3 d. 2, 3, and 4

ANS: D
Glass and margarine are always considered amorphous solids. Plastic usually shows flexibility, which implies that it has amorphous features, so it should be considered amorphous. Iron, however, has well-organized atoms in a crystalline arrangement.