What is a very small fragments of lava or rock blasted into the air by volcanic explosion?

What is a very small fragments of lava or rock blasted into the air by volcanic explosion?
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If our planet was full of volcanic dust in the air, would it help if we could "see" Xrays?

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Which of the following is not a natural source of air pollution? (A) Volcanic eruptions and lightening discharges (B) Biological decay of vegetable matter (C) Photochemical oxidation of organic matter (D) None of these

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