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The following is a list providing an overview of sovereign states around the world with information on their status and recognition of their sovereignty. The 205 listed states can be divided into three categories based on membership within the United Nations System : 193 UN member states , [ 1 ] two UN General Assembly non-member observer ...
The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.
List of sovereign states by male to female income ratio; List of sovereign states by market capitalization of listed domestic companies; List of sovereign states by Official Development Assistance received; List of sovereign states by research and development spending; List of sovereign states by wealth inequality
List of sovereign states; List of political and geographic subdivisions by total area, comparing continents, countries, and first-level administrative country subdivisions. List of first-level administrative divisions by population; List of FIPS region codes in FIPS 10-4, withdrawn from the Federal Information Processing Standard (FIPS) in 2008
The list of names in Country and Region Codes for Statistical Use of the UN Statistics Division is based on the bulletin Country Names and other UN sources. Once a country name or territory name appears in either of these two sources, it will be added to ISO 3166-1 by default.
[1] [2] Ozone is also an important constituent of the stratosphere, where the ozone layer (2 to 8 parts per million ozone) exists which is located between 10 and 50 kilometers above the Earth's surface. [3] The troposphere extends from the ground up to a variable height of approximately 14 kilometers above sea level.
The name ozone derives from ozein (ὄζειν), the Greek neuter present participle for smell, [7] referring to ozone's distinctive smell. In appropriate contexts, ozone can be viewed as trioxidane with two hydrogen atoms removed, and as such, trioxidanylidene may be used as a systematic name, according to substitutive nomenclature.
This list divides the world using the seven-continent model, with islands grouped into adjacent continents. Variations on are noted below and discussed in the following articles: Continent , Boundaries between the continents of Earth , and List of transcontinental countries .