TeachMeFinance.com - explain Blocks
Blocks The term 'Blocks' as it applies to the area of volcanos can be defined as ' Tephra is the general term now used by volcanologists for airborne volcanic ejecta of any size. Historically, however, various terms have been used to describe ejecta of different sizes. ... Fragments larger than about 2.5 inches are called blocks if they were ejected in a solid state and volcanic bombs if ejected in semi-solid, or plastic, condition. Fragments of lava or rock larger than 64 millimeters in size that are blasted into the air by volcanic explosions'.
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