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Orionids
Orionids are a group of meteors that fall into the atmosphere as...
Oort cloud
The Oort Cloud is a spherical cloud composed of small...
Ontogeny
Ontogeny is the process by which an organism achieves its...
Ozone layer
The ozone layer is the layer located in the stratosphere that...
Orson Welles
Orson Welles was a famous specialist who stood out during his...
Oligopoly
An oligopoly is a small group of bidders who sell products...
Operating system
An operating system is nothing more than a set of applications or...
Obstacle race
The obstacle race is something similar to mixing the toughest...
Oligopsony
Oligopsony is part of the imperfect competition that occurs in a...
Oscillating universe theory
The oscillating universe theory is the cosmological theory that combines the...
Orography
The orography is a physical geography branch that is in charge of...
Onomatopoeia
The onomatopoeia is a word that represents or imitates a natural...