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A ________ Is "Unpredictable, Short-Lived, and Without Social, Economic, and Political

question 28

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A ________ is "unpredictable, short-lived, and without social, economic, and political significance."


Definitions:

Vesicles

Small holes found in a volcanic rock, representing gas bubbles in a magma that were trapped when the lava solidified.

Welded Tuff

A type of rock formed by the compaction and cementation of volcanic ash and debris, heated enough post-deposition to weld together.

Scoria

A dark gray, black, or reddish volcanic rock that contains abundant vesicles, usually having the composition of basalt or andesite; synonymous with volcanic cinders.

Basalt

A dark, fine-grained volcanic rock formed from the rapid cooling of magnesium- and iron-rich lava, characteristic of oceanic crust.

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