Which of the following signs can be short-term, distinct warning signals sent out by volcanoes before erupting?
a. Changes in heat flow (increased local heat flow)
b. Changes in shape (surface bulge)
c. Increases in gas and steam emission
d. All of the above
e. Both a and b
Answer: d. All of the above
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A blocky clastic sedimentary rock composed of silt would be called a(n)
A) sandstone. B) arkose. C) siltstone. D) mudstone.
Which of the following is the standard unit of ocean depth?
A) Mile B) Fathom C) Foot D) Meter E) League
What are the major demographic trends for this region, and what factors explain these patterns?
What will be an ideal response?
Rossby waves
A) are most evident at the surface. B) are responsible for midlatitude cyclones in North America. C) move westward with the polar easterlies. D) are usually absent in winter. E) all of the above