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Blocks is the name used for the biggest pieces of tephra. Tephra is produced by a volcanic eruption.
why is tephra dangerous: Tephra is usually dangerous because it can come in small sizes or bigger sizes it is made up of rock and smoke
Tephra is basically ash, rock, cinders, and solidified lava spurted from a volcano.
Tephra is stuff that comes out of the volcano, it is mainly disposed as rocks.
no its metamorphic