Osmium is a chemical element located in the group of...
The onomatopoeia is a word that represents or imitates a natural...
The orography is a physical geography branch that is in charge of...
The oscillating universe theory is the cosmological theory that combines the...
Oligopsony is part of the imperfect competition that occurs in a...
The obstacle race is something similar to mixing the toughest...
An operating system is nothing more than a set of applications or...
An oligopoly is a small group of bidders who sell products...
Orson Welles was a famous specialist who stood out during his...
The ozone layer is the layer located in the stratosphere that...
