It's the same as "a pile of sand" or "an armful of firewood". That's how you do it with uncountables. You could have a pile of rocks or an armful of sticks, and those are countable and take a plural.
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It's the same as "a pile of sand" or "an armful of firewood". That's how you do it with uncountables. You could have a pile of rocks or an armful of sticks, and those are countable and take a plural.