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.
UV light is broken into three different types: UVA, UVB and UVC. 1  UVA has longer wavelengths and passes through glass easily; experts disagree about whether or not UVA damages the eyes. 2  UVB rays are the most dangerous, making sunglasses and sunscreen a must; they don't go through glass.