A(n) ________ is a mix of gas and dust emitted by a volcano that is so dense that it hugs the ground.

A. lava flow
B. obsidian
C. pyroclastic flow
D. tuff flow
E. pahoehoe flow


Answer: C

Environmental & Atmospheric Sciences

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South Asia's external trade links were well-established by ancient Greek and Roman times, but its seaborne trade, prior to the arrival of the Europeans in the 1500s, was controlled by

A. the Sinhalese. B. the Mughal Empire's navy. C. the Chinese. D. Arabs.

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Contrast weathering, mass wasting, and erosion

What will be an ideal response?

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An unknown mineral sample scratches fluorite but cannot scratch apatite. What is the approximate hardness of this mineral?

A. 4 B. 3.5 C. 5 D. 4.5

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________ processes, such as evaporation or precipitation, can precipitate chemical sediments

A) Biological B) Detrital C) Inorganic D) Organic

Environmental & Atmospheric Sciences