Radon is a gas that occurs naturally from the breakdownâor the radioactive decayâof uranium. Rocks, soil, and in some cases groundwater can all contain uranium.Because radon comes from so many sources, people are easily exposed to it.adon is an odorless, colorless, radioactive gas. It is also the second leading cause of lung cancer in the United States.
File Menu in MS Excel: File menu is the first menu in the MS Excel menu bar. It functions the file management and importing from external sources to MS Excel. The File menu allows one to open, save, close, print and so on in MS Excel. It gives the users options to save the workbook, open new workbook and so on.
Clicking on an item in the menu executes the indicated function or generates another menu. In a variant of the drop-down menu called a fly-out, the list appears to the side of the clicked item. A pop-up menu appears above the clicked item when the main list is at the bottom of the window or screen.