Volcanic blocks are fragments of
rock which measure more than 64mm in size and are erupted in a solid condition. Blocks are formed from material from previous eruptions or from
country rock and are therefore mostly accessory or accidental in origin. Blocks also occur due to the impact and breakage of
volcanic bombs (a bomb is a block with streamlined appearance, often expelled in a molten state). Bombs can also occur due to the disruption of the crust of a lava dome that has formed up or over a vent during an eruption.
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