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Choose the One Most Appropriate Answer for Each

question 71

Multiple Choice

Choose the one most appropriate answer for each.
-fixed mark of known location and elevation


Definitions:

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.

Basaltic Lava

A type of lava that flows from volcanic eruptions, characterized by its low viscosity and high iron and magnesium content.

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