8). The total relief of the ocean surface (not counting waves or tides) is only about 1.5 meters, but this is sufficient to drive the ocean circulation. To understand how the wind stress distorts sea level, with hills at the convergences, valleys at the divergences, one needs to invoke the hydrostatic relationship.
Also termed solar cheilosis, this condition is the result of chronic over-exposure to ultraviolet radiation in sunlight. It usually occurs on the lower lip, which is dry, scaling, and wrinkled grey-white in appearance. It is especially common in people with light skin types who live in sunny climates (e.g. , Australians of European ancestry), and in persons who spend a lot of time outdoors.
Causes of Twitching of the lip. This section discusses 5 medical conditions causing Twitching of the lip. A simple discussion of these causes with additional information is below. Some of the possible common medical causes of Twitching of the lip may include: 1  Hypocalcemia.  Parathyroidectomy.