________ 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.
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
In what direction did Georges travel as it crossed the ocean? What will be an ideal response?