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.
1 Gamma radiation and x rays are electromagnetic radiation like visible light, radiowaves, and ultraviolet light. 2  These electromagnetic radiations differ only in the amount of energy they have. 3  Gamma rays and x rays are the most energetic of these. Beta radiation may travel several feet in air and is moderately penetrating. 2  Beta radiation can penetrate human skin to the germinal layer, where new skin cells are produced. 3  If high levels of beta-emitting contaminants are allowed to remain on the skin for a prolonged period of time, they may cause skin injury.