trench warfare | Definition, History, & Facts | Britannica
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Trench Warfare Definition: a type of combat in which opposing troops fight from trenches facing each other. Strategy used during WWI. Little progress. - ppt download
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The Yellow Excavator Digs a Trench, Construction Works by Means of Automobile Equipment Stock Photo - Image of ground, black: 215798538
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plate tectonics - Is the Mid-Atlantic Ridge a ridge or a trench? - Earth Science Stack Exchange
The Yellow Excavator Digs a Trench, Construction Works by Means of Automobile Equipment Stock Image - Image of excavation, bailer: 214966605
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