Geologiaj

Geologiaj is the plural form of the Esperanto adjective geologia, meaning geological. It is used to describe multiple geological features, phenomena, or topics and does not signify a separate scientific field by itself. In Esperanto, adjectives agree with the nouns they modify in number; the plural form geologiaj is used with plural nouns. When a noun phrase is in the accusative case, the ending -n is added to the entire phrase, yielding forms such as geologiajn fenomenojn.

Etymology and grammar: geologia derives from the root related to geology, combined with the standard Esperanto adjective suffix -a. For plural usage, the ending -j marks the adjective as plural, and -n marks the accusative. Thus geologiaj formacioj means geological formations, while geologiajn formaciojn means geological formations as the direct object of a sentence.

Usage: Geologiaj appears in Esperanto texts dealing with earth sciences, geography, and related fields when referring to multiple geological aspects. Examples include geologiaj fenomenoj (geological phenomena) and geologiaj formacioj (geological formations). The construction is common in academic, educational, and scientific writing.

Relation to other terms: The noun for the science is geologio (geology), with plural geologioj. A person who studies rocks is a geologo (geologist), plural geologoj. The adjective geologia remains the descriptive partner to nouns, while geologio and geologo are the corresponding nouns in the field.

See also: geologio, geologio (geology); geologo (geologist).