what is World Physiology ????

• Earth Age: The world is now thought to about 4.55 billion years old. Just about one-third of the 13 billion-year ago estimated for the universe.

• Area: total 510.072 million sq km.,Land 148.94 million sq km (29.2%): Water361.132 million sq km (70.8%)

• Land Boundaries: Total 250,472 km (not counting shared boundaries twice ). Coastline: 356.000 km.

• Terrain : Highest elevation is MT. Everest at 8,850m.( 290,035 ft) and lowest and deprossion is the Dead Sea at -441 m . (1,349 ft) below sea level. The great ocean depth is the Mariana Trench at 10,924 m. (35,840 ft). in the Pacific Ocean.

• Irrigated Land: 2,714,320 sq.km (1,048,005 sq.mil)