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.
Certain factors can exacerbate the patches of dry skin that develop around your mouth. This includes frequently licking your lips, according to NetDoctor. If you live in a cold climate, cold weather can dry the skin, causing patches to develop on the lips.
If that black spot on your lower lip is scaring you, a dermatologist explains four possible causes including cancer. Keep in mind that what appears to be black may actually be a deep dark purple, or, if the speck is small enough, you may notice upon very close inspection that itâs actually medium brown.