es all abbreviations and acronyms
used in the Factbook, with their expansions.

Administrative divisions: This entry generally gives the
numbers, designatory terms, and first-order administrative
divisions as approved by the US Board on Geographic Names
(BGN). Changes that have been reported but not yet acted on
by BGN are noted.

Age structure: This entry provides the distribution of the
population according to age. Information is included by sex
and age group (0-14 years, 15-64 years, 65 years and over).
The age structure of a population affects a nation's key
socioeconomic issues. Countries with young populations (high
percentage under age 15) need to invest more in schools,
while countries with older populations (high percentage ages
65 and over) need to invest more in the health sector. The
age structure can also be used to help predict potential
political issues. For example, the rapid growth of a young
adult population unable to find employment can lead to
unrest.

Agriculture--products: This entry is a rank ordering of major
crops and products starting with the most important.

Airports: This entry gives the total number of airports. The
runway(s) may be paved (concrete or asphalt surfaces) or
unpaved (grass, dirt, sand, or gravel surfaces), but must be
usable. Not all airports have facilities for refueling,
maintenance, or air traffic control.

Airports--with paved runways: This entry gives the total
number of airports with paved runways (concrete or asphalt
surfaces). For airports with more than one runway, only the
longest runway is included according to the following five
groups --(1) over 3,047 m, (2) 2,438 to 3,047 m, (3) 1,524 to
2,437 m, (4) 914 to 1,523 m, and (5) under 914 m. Only
airports with usable runways are included in this listing.
Not all airports have facilities for refueling, maintenance,
or air traffic control.

Airports--with unpaved runways: This entry gives the total
number of airports with unpaved runways (grass, dirt, sand,
or gravel surfaces). For airports with more than one runway,
only the longest runway is included according to the
following five groups--(1) over 3,047 m, (2) 2,438 to 3,047
m, (3) 1,524 to 2,437 m, (4) 914 to 1,523 m, and (5) under
914 m. Only airports with usable runways are included in
this listing. Not all airports have facilities for
refueling, maintenance, or air traffic control.

Appendixes: This section includes Factbook-related material
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