They are usually made of piles of lava, not ash. During the eruption, blobs ("cinders") of lava, blown into the air, break into small fragments that fall around the opening to the volcano.
They are usually made of piles of lava, not ash. During the eruption, blobs "cinders" of lava, blown into the air, break into small fragments that fall around the opening to the volcano. Hope this helps!!!
