Cloud the bottom of the hierarchy. Clouds in the troposphere assume five physical forms based on structure and process of formation. These forms are commonly used for the purpose of satellite analysis. They are given below in approximate ascending order of instability or convective activity. "Non-convective" stratiform clouds appear in "stable" airmass conditions and, in general, have flat sheet-like structures that can form at any altitude in the troposphere. The stratiform group is divided by altitude range into the genera cirrostratus (high-level), altostratus (mid-level), stratus (low-level), and nimbostratus (multi-level). Fog is commonly considered a surface-based cloud layer. The fog may form
The Who, What, or Where Game for "The Who, What, or Where Game" was written by George David Weiss. According to an audio clip from a 1973 episode, at least the closing theme had been changed before the end of program's run, but no further information has materialized. Milton Bradley produced two home editions of "The Who, What, or Where Game". The home game format was almost identical to that of the show, fairly unusual for board game of television shows of that era. In 1973, a short-lived British version aired on BBC1 hosted by David Jacobs. The Who, What, or Where Game The Who, What,