Columbia Encyclopedia
Search results
500 results found
Aïr Massif
(Encyclopedia)Aïr Massif or Aïr Mountains, Africa: see Sahara. ...air navigation
(Encyclopedia)air navigation, science and technology of determining the position of an aircraft with respect to the surface of the earth and accurately maintaining a desired course (see navigation). Basic to air ...air plant
(Encyclopedia)air plant: see epiphyte.air pollution
(Encyclopedia)air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air pollution are t...air bag
(Encyclopedia)air bag: see automobile.air bladder
(Encyclopedia)air bladder, in fish: see swim bladder. ...air brake
(Encyclopedia)air brake: see brake.air cargo
(Encyclopedia)air cargo: see aviation.air embolism
(Encyclopedia)air embolism: see embolus.air forces
(Encyclopedia)air forces, those portions of a nation's military organization employing heavier-than-air aircraft for reconnaissance, support of ground troops, aerial combat, and bombing of enemy lines of communicat...Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
-
Places
+-
- Africa
- Asia
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-
