One exception to this is the Biological Data Profile of the FGDC. To go along with Bounding Coordinates specifying the extent of the data in the dataset, the profile specifies a mandatory Description of Geographic Extent element to provide a text description of the extent of the study and/or data set.
Calm, peaceful days. The Halcyon is a bird of Greek legend and the name is now commonly given to the European Kingfisher. The ancients believed that the bird made a floating nest in the Aegean Sea and had the power to calm the waves while brooding her eggs.
Halons are a family of chemicals similar to Chlorofluorocarbons (CFCs), but containing at least one atom of bromine. Like CFCs, Halons are very unreactive and stable, non-flammable and non-toxic. At room temperature, they are usually colourless gases or liquids which evaporate easily.