Translations:AY Honors/Volcanoes/Answer Key/37/en

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Blocks are formed from material from previous eruptions or from country rock and are herefore 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.