blue hole
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English
[
edit
]
Noun
[
edit
]
blue
hole
(
plural
blue holes
)
English
Wikipedia
has an article on:
blue hole
Wikipedia
A
submarine
cave
or
sinkhole
, a roughly
circular
, steep-walled
depression
that is typically
anoxic
below a certain depth.
Categories
:
English lemmas
English nouns
English countable nouns
English multiword terms
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