A number of factors can lead companies to close stores. One is mergers and acquisitions activity. As organizations join forces under a single umbrella, locations that once competed for sales can become redundant, leading to store closings.
There are 3 types of ultraviolet (UV) rays: 1  Ultraviolet A rays (UVA) make up most of the sun's natural light. They can penetrate deep into the skin, causing wrinkles and premature aging of the skin.  Ultraviolet B rays (UVB) are the main cause of sunburn. They are nearly 1,000 times stronger than UVA rays.
Ultraviolet radiation can aggravate several skin conditions and diseases, including: 1  Systemic lupus erythematosus. 2  SjÃ¶gren's syndrome. 3  Sinear Usher syndrome. 4  Rosacea. 5  Dermatomyositis. 6  Darier's disease. 7  KindlerâWeary syndrome.