I saw a sentence like "Some coastal waters and rivers can have such a high concentration of suspended sediment and floating plant material that light only penetrates surface a foot or so" In this sentence, is "a foot or so" meaning as "a little bit"?

closed as off-topic by tchrist Feb 7 at 4:58

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A foot is a measure of distance equal to 12 inches or roughly 30 centimeters. So this sentence says that because the water is so murky and full of debris, light penetrates approximately ("or so") that distance.

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