black shale
black shale · black shales
A dark, muddy rock, rich in sulfides and organic materialA dark, muddy rock, rich in sulfides and organic material.
Meaning
1 senses(countable, uncountable)A dark, muddy rock, rich in sulfides and organic material.
Forms
plural: black shales| Singular | black shale |
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| Plural | black shales |
regular
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable