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Mariana Trench
Marianao
Marianne
Maricopa
mariculture
Marie Byrd Land
Marie-Galante
Marietta
marigold
marigram
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marijuana
marimba
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marine snow
ma·rine snow


noun 
Definition:
 
ocean debris: small particles of organic and inorganic debris that drift down from the upper layers of the ocean to the bottom
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