Geological period
volume
British pronunciation/dʒˌɪəlˈɒdʒɪkəl pˈiəɹɪəd/
American pronunciation/dʒˌɪəlˈɑːdʒɪkəl pˈiəɹɪəd/

تعریف و معنای "geological period"

Geological period
01

a unit of geological time during which a system of rocks formed

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