Surface water is naturally replenished by precipitation and naturally lost through discharge to the oceansevaporationevapotranspiration and groundwater recharge. Although the only natural input to any surface water system is precipitation within its watershedthe total quantity of water in that system at any given time is also dependent on many other factors. These factors include storage capacity in lakes, wetlands and artificial reservoirsthe permeability of the soil beneath these storage bodies, the runoff characteristics of the land in the watershed, the timing of the precipitation and local evaporation rates. All of these factors also affect the proportions of water loss.
Abbreviationswhich includes all abbreviations and acronyms used in the Factbook, with their expansions. Acronyms An acronym is an abbreviation coined from the initial letter of each successive word in a term or phrase.
In general, an acronym made up of more than the first letter of the major words in the expanded form is rendered with only an initial capital letter Comsat from Communications Satellite Corporation; an exception would be NAM from Nonaligned Movement.
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 the BGN are noted.
Geographic names conform to spellings approved by the BGN with the exception of the omission of diacritical marks and special characters. Age structure This entry provides the distribution of the population according to age.
Information is included by sex and age group as follows: 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 an ordered listing of major crops and products starting with the most important.
Airports This entry gives the total number of airports or airfields recognizable from the air. The runway s may be paved concrete or asphalt surfaces or unpaved grass, earth, sand, or gravel surfaces and may include closed or abandoned installations.
Airports or airfields that are no longer recognizable overgrown, no facilities, etc. Note that not all airports have accommodations 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 by length.
For airports with more than one runway, only the longest runway is included according to the following five groups - 1 over 3, m over 10, ft2 2, to 3, m 8, to 10, ft3 1, to 2, m 5, to 8, ft4 to 1, m 3, to 5, ftand 5 under m under 3, ft.
Only airports with usable runways are included in this listing. Not all airports have facilities for refueling, maintenance, or air traffic control. The type aircraft capable of operating from a runway of a given length is dependent upon a number of factors including elevation of the runway, runway gradient, average maximum daily temperature at the airport, engine types, flap settings, and take-off weight of the aircraft.
Airports - with unpaved runways This entry gives the total number of airports with unpaved runways grass, dirt, sand, or gravel surfaces by length. Appendixes This section includes Factbook-related material by topic.Water resources are natural resources of water that are potentially useful.
Uses of water include agricultural, industrial, household, recreational and environmental activities. All living things require water to grow and reproduce. Meet the Carolina Population Center Faculty Fellows elected in Five new Fellows elected to begin research at CPC this fall.
The Department of Sustainability, Environment, Water, Population and Communities was an Australian government department that existed between September and September Scope.
Information about the department's functions and/or government funding allocation could be found in the Administrative Arrangements Orders, the annual Portfolio Budget Statements, in the department's .
availability of water resources. The exact number of people living on Earth in the coming decades is uncertain, but we do know that the population will continue growing, and this will impact water . Ecoscience: Population, Resources, Environment [Paul R.
Ehrlich, John P. Holdren, Anne H. Ehrlich] on alphabetnyc.com *FREE* shipping on qualifying offers. Provides documented information on all aspects of the population-food-environment crisis.
Water resources are natural resources of water that are potentially useful. Uses of water include agricultural, industrial, household, recreational and environmental activities. All living things require water to grow and reproduce. 97% of the water on the Earth is salt water and only three percent is fresh water; slightly over two thirds of this is frozen in glaciers and polar ice caps.