The salty water that fills the oceans and seas, containing dissolved salts and minerals.
Compound of 'sea' (from Old English 'sǽ') and 'water' (from Old English 'wæter'). A straightforward descriptive term used since Old English times.
Seawater is so salty because salt minerals have been washing into the ocean for billions of years from rocks and soil, and nothing removes the salt—it just keeps accumulating!
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