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.
2.Penetrating power. There are various types of radiation, including alpha rays, beta rays, and gamma rays. The penetrating power of the radiation depends on what type of radiation it is.X-rays are another type of radiation..Penetrating power. There are various types of radiation, including alpha rays, beta rays, and gamma rays. The penetrating power of the radiation depends on what type of radiation it is.