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Amerigo Vespucci
Amerigo Vespucci was an Italian merchant who arrived in Spain long...
Astrophysics
Astrophysics is a branch of space science that applies the laws of...
Astrolabe
The astrolabe is an instrument that was used in astronomy to...
Air pollution
Air pollution occurs when a series of toxic gases come into direct contact...
Atmospheric pollution
Atmospheric pollution means the presence of impurities or the increase of...
Noise pollution
Noise pollution is the excess of sound that negatively affects the...
Aerodrome
An aerodrome is a Greek concept that is used to refer to the flat...
Avogadro’s number
The Avogadro's number is a constant used in analytical chemistry to...
Agoraphobia
Agoraphobia is an anxiety attack that causes the sufferer to avoid...
Asteroid
An asteroid is a body in space smaller than the planets found in our...
Autocracy
Autocracy is the type of government in which power is concentrated in a...
Acoustic guitar
Acoustic guitar is a musical instrument that belongs to the string...