Relating to or formed by the process of deposition, especially the settling and accumulation of material like sediment, minerals, or rock.
From 'deposition' (from 'deposit' + '-tion') + '-al' meaning 'relating to.' Used heavily in geology and earth sciences.
Geologists use 'depositional' to describe how layer after layer of sand, mud, and shells pile up to form new rock—if you could see this in fast-motion, it would look like the earth is slowly writing its own history book.
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