How is magma created in a subduction zone?
A. Subduction brings one plate to a depth hot enough for minerals in the plate to melt.
B. Friction between the two plates causes the lithosphere to melt.
C. Subduction brings one plate to a depth hot enough for minerals to release water; this water causes melting in the overlying asthenosphere.
Answer: C
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A caldera similar to this one filled with water to become Crater Lake in Oregon (42°56'42"N, 122°06'01"W; see Figure 35-2). Why isn’t the Okmok Caldera presently filled with water?
The question is based on Map T-2, the “Umnak, Alaska,” topographic map (scale 1:250,000; contour interval 200 feet), Map T-21b, a satellite image; and Figures 35-3 and 35-4, a shaded relief map and a stereogram showing the Okmok Caldera (53°25'33"N, 168°07'38"W) on Umnak Island in the Aleutian Islands. What will be an ideal response?
The "geography of nowhere" was lamented by:
A) Wes Flack. B) James Howard Kunstler. C) Edward Relph. D) Douglas Pocock. E) J.E. Tunbridge.
What are the main branches of Christianity?
What will be an ideal response?
Which of the following is a stage in the life cycle of a massive star?
a. Eclipse b. Asteroid c. Corona d. Supernova