Agoraphobia is an anxiety attack that causes the sufferer to avoid...
The Avogadro's number is a constant used in analytical chemistry to...
An aerodrome is a Greek concept that is used to refer to the flat...
Noise pollution is the excess of sound that negatively affects the...
Atmospheric pollution means the presence of impurities or the increase of...
Air pollution occurs when a series of toxic gases come into direct contact...
Astrophysics is a branch of space science that applies the laws of...
The astrolabe is an instrument that was used in astronomy to...
Amerigo Vespucci was an Italian merchant who arrived in Spain long...
An archipelago is a numerous group of islands close to each other...
