Search on: OCEANIC TRENCH 
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Descriptor English:   Oceanic Trench 
Descriptor Spanish:   Fosa Oceánica 
Descriptor Portuguese:   Fossa Oceânica 
Synonyms English:   Abyssal Trench
Trench  
Tree Number:   SP8.473.654.517.272
Definition English:   Deep steep-sided depression in the ocean floor caused by the subduction of oceanic crust beneath either other oceanic crust or continental crust. (UCMP Glossary of Natural History Terms - http://www.ucmp.berkeley.edu/glossary/gloss2geol.html) 
Record Number:   35182 

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