________ is a hill or mountain formed by the extrusion of lava or ejection of rock fragments from a vent.
A. Flank eruption
B. Caldera
C. Volcano
D. Pillow lava
E. Cinder cone
Answer: C
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A volcanologist extracts a piece of rock near a volcano site and observes no visible crystals. After studying the rock for a while, he assumes it is obsidian. Why does he do so?
A) Obsidian is always hot. B) Obsidian forms underground. C) Obsidian is green. D) Obsidian forms in lava flows.
In what direction did Georges travel as it crossed the ocean? What will be an ideal response?
A blue norther
A) could not occur in winter. B) involves cP air moving down from the Rockies. C) features rain-laden, dark "blue" clouds. D) would most likely hit the Southeast. E) all of the above
A condition that causes a system to change dramatically is a ____
a. feedback b. threshold c. model d. subsystem