"Lapilli <span>are pyroclastic materials that are larger than ash but smaller than blocks or bombs.</span>"
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.
