South America is a proper noun due to it being the name of a place.
South American, North American
In English, the adjective form of the noun Argentina may be Argentinian, Argentine, or more rarely the combined form Argentinean. The most common demonym (a person) seems to be Argentine.
The proper adjective for Inca is Incan. An example sentence: They traveled to South America to tour the Incan ruins. In Spanish, the proper adjective is Incaico, as in Imperio Incaico (Inca Empire)
No, it is not. South America is a proper noun and South American is a proper adjective. There is no adverb form used for most place names.
South American is the proper adjective meaning from South America. For instance, South American vaqueros have a lot in common with North American cowboys.
Large and varied are both adjectives. South would be an adjective if it were not part of a proper noun. Amazon is likely a noun adjunct here, but Amazonian would be a proper adjective.
Southern
No.
The proper adjective for Inca is Incan. An example sentence: They traveled to South America to tour the Incan ruins. In Spanish, the proper adjective is Incaico, as in Imperio Incaico (Inca Empire)
The common noun for the proper noun South America is continent.
The proper adjective is American, describing the noun 'literature' as 'of America'.
Yes, the compound noun 'South America' is a proper noun, the name of a specific continent. A proper noun is always capitalized.
The proper adjective is "American," derived from the proper noun "America."