a) The acids that cause decay are bacterial waste products. The bacteria that cause cavities are living organisms. And just like all living things they consume food and in return create waste products. As it happens, the wastes that these types of bacteria create are very acidic (they have a pH of 4 and lower).
Metaphor Examples. A metaphor is a comparison between two unlike things not using the word âlikeâ or âasâ to make the comparison. Metaphors can be powerful, but they can also be tricky to identify at times. This page contains 100 metaphor examples. I have separated the metaphors on this page into two lists. The first list contains metaphors that are easier to comprehend and identify.
More Notes on Metaphors.  1 A noble metaphor, when it is placed to an advantage, casts a kind of glory round it, and darts a lustre through a whole sentence..  2 Metaphor is embodied in language. . . .  3 Effective metaphor does more than shed light on the two things being compared.