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metamorphic rocks, the blocks may have a plate-like or slab-like form. In other cases, blocks derived from great depths may resemble polished water-worn pebbles and are cobbled due to fluidisation and upwards transport.
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Blocks are nearly always angular to sub-angular and roughly equidimensional. If the parent rock is flow-foliated lava, sedimentary material or
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and are therefore mostly accessory or accidental in origin. Blocks also occur due to the impact and breakage of
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that measures more than 64 mm (2.5 in) in diameter and is erupted in a solid condition.
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Blocks can be enormous and may be transported great distances from the
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discharged blocks weighing 2-3 tons over distances of 100-200m.
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Blocks are formed from material from previous eruptions or from
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