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Amerigo Vespucci
Amerigo Vespucci was an Italian merchant who arrived in Spain long...
Astrolabe
The astrolabe is an instrument that was used in astronomy to...
Astrophysics
Astrophysics is a branch of space science that applies the laws of...
Noise pollution
Noise pollution is the excess of sound that negatively affects the...
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...
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...