Examlex
There are three resonance structures of the sulfate ion.A resonance structure can be written where the formal charge on sulfur is 0.
Inca
A South American indigenous empire with an advanced society, thriving in what is now Peru from the 13th to the 16th century until the Spanish conquest.
Hydraulic Theory
A theory suggesting that the development and maintenance of a civilization is closely linked to its ability to create and manage large-scale water control systems.
River Valleys
Geographical areas formed by the land surrounding a river, often characterized by fertile soil and significant for early human civilizations.
Hydraulic Theory
A theory that suggests the control and management of water resources played a crucial role in the development of early civilizations.
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