Plural of earthwork; fortifications or constructions made from earth, or the art of building such structures.
Simple plural of 'earthwork' by adding '-s'. The term expanded from military contexts to include any significant earth-moving construction projects.
Cahokia Mounds in Illinois is the largest prehistoric earthwork north of Mexico, featuring 80 mounds built by the Mississippian civilization—some still standing mysteriously tall despite being over 1,000 years old, rivaling Egyptian pyramids in engineering ambition!
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