To nullify means to render ineffective. If you nullify a contract. a warranty, or even a marriage, the effect is as if the thing had never happened. In law ( which is sometimes redundant ) things are sometimes said to be null and void - that is, nothing and nothing. Another example of legal redundancy is the term cease and desist which literally means: stop and stop.
Although they are not true examples of this type of wave, the waves on the surface of water approximate _ transverse _ waves. 7. The distance between two successive wave crests (or troughs) is called the. _ wavelength _ of the wave. 8. The height of a wave crest (or depth of trough) above the original undisturbed surface is called the _ amplitude _ of the wave. 9.
Some of the ridges are almost straight; others are slightly wavy. They range up to about 10 metres in height and 30 metres in width. Many are more than one and one-half kilometres long. Both sides of these dunes have practically the same slope and are usually covered with grass and shrubs. While the crest is usually bare of vegetation, on some dunes, even the crest is covered.