Welded tuff consists of ash surrounding large, jagged, irregularly-shaped pieces of material. What is this material and where does it come from?

A) Mineral crystals that formed during cooling
B) Rock fragments that erupted from the volcano
C) Gas pockets from volatiles in the lava
D) Slivers of volcanic glass from the lava


Answer: B

Environmental & Atmospheric Sciences

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the troposphere and the stratosphere tropical and polar air masses the troposphere and mesosphere two layers of high ozone concentration

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Which vegetation type found in the Russian Federation represents a cold-resistant, coniferous forest?

A) steppe B) tundra C) taiga D) volga E) none of these

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Fracking is most closely associated with ________

A) natural gas B) oil C) conventional extraction D) fossil fuels in sandstones E) an environmentally safe extraction method

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