resources and an exclusive fishing zone;
boundary situations with neighboring states prevent many countries
from extending their fishing or economic zones to a full 200 nm

Climate:
two large areas of polar climates separated by two rather narrow
temperate zones form a wide equatorial band of tropical to
subtropical climates

Terrain:
the greatest ocean depth is the Mariana Trench at 10,924 m in the
Pacific Ocean

Elevation extremes:
lowest point: Bentley Subglacial Trench -2,540 m
note: in the oceanic realm, Challenger Deep in the Mariana Trench is
the lowest point, lying -10,924 m below the surface of the Pacific
Ocean
highest point: Mount Everest 8,850 m

Natural resources:
the rapid depletion of nonrenewable mineral resources, the
depletion of forest areas and wetlands, the extinction of animal and
plant species, and the deterioration in air and water quality
(especially in Eastern Europe, the former USSR, and China) pose
serious long-term problems that governments and peoples are only
beginning to address

Land use:
arable land: 10.73%
permanent crops: 1%
other: 88.27% (2001)

Irrigated land:
2,714,320 sq km (1998 est.)

Natural hazards:
large areas subject to severe weather (tropical cyclones), natural
disasters (earthquakes, landslides, tsunamis, volcanic eruptions)

Environment - current issues:
large areas subject to overpopulation, industrial disasters,
pollution (air, water, acid rain, toxic substances), loss of
vegetation (overgrazing, deforestation, desertification), loss of
wildlife, soil degradation, soil depletion, erosion

Geography - note:
the world is now thought to be about 4.55 billion years old, just
about one-third of the 13-billion-year age estimated for the universe

People World

Population:
6,446,131,400 (July 2005 est.)

Age structure:
0-14 years: 27.8% (male 919,726,623; female 870,468,158)
15-64 years: 64.9% (male 2,117,230,183; female 2,066,864,970)
65 years and over: 7.3% (male 207,903,775; female 263,627,270)
note: some countries do not maintain age structure information, thus
a slight discrepancy exists between the total world population and
the total for world age structure (2005 est.)

Median age:
total: 27.6 years
male: 27 years
female: 28.2 years (2005 est.)

Population growth rate:
1.14% (2005 est.)

Birth rate:
20.15 births/1,000 population (2005 est.)

Death