Are pyroclastic materials that are larger than ash but smaller than blocks or bombs

"Lapilli are pyroclastic materials that are larger than ash but smaller than blocks or bombs."

Lapilli is pyroclastic material that has a dimention of 2 to 64 mm. Lapilli are of really low density what gives them the ability to be projected and taken far in a volcanic explosion. They start by being molten/semi-molten lava that solidifies as travelling through the air or reaching the water.

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