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.
Environmental & Atmospheric Sciences
Contrast weathering, mass wasting, and erosion
What will be an ideal response?
Environmental & Atmospheric Sciences
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
Environmental & Atmospheric Sciences
________ processes, such as evaporation or precipitation, can precipitate chemical sediments
A) Biological B) Detrital C) Inorganic D) Organic
Environmental & Atmospheric Sciences