Plural of 'diluvium'; geological deposits left behind by ancient floods, particularly those associated with the biblical flood.
From Latin 'diluvium' (flood, deluge), derived from 'diluere' (to wash away). The plural form '-ia' follows Latin neuter noun patterns. Originally used by geologists to describe flood deposits.
Before modern geology, 'diluvia' were thought to be evidence of Noah's flood, but when scientists examined them closely, they realized these deposits came from many different ancient floods—a breakthrough moment for understanding Earth's history.
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