The formation of a giant continental caldera includes all but which of the following?
A. Magma pours out in high-volume pyroclastic flows, causing the ground surface to sink into a caldera.
B. Removal of magma decreases the pressure on the magma below the caldera, causing new magma to bulge up the caldera floor.
C. Rising magma forms a low-density cap rich in SiO2 and gases, bulging the ground surface upward.
D. Basaltic eruptions begin forming circular fractures surrounding the bulge.
Answer: D
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One approach to decreasing birth rates is to increase the education of
A) children. B) contraceptives. C) women. D) men. E) college graduates.
The main physical area of New Zealand consists of two main islands separated from Australia's southeastern region by the _________________.
Fill in the blank(s) with the appropriate word(s).
The region of the atmosphere that is so evenly mixed that it behaves as if it were a single gas is the
A) homosphere. B) heterosphere. C) exosphere. D) thermosphere.
Which of the following statements describes the usual direction and speed of atmospheric shortwaves?
A. They move west to east, and are faster than longwaves. B. They move east to west, and are slower than longwaves. C. They move east to west and are faster than longwaves. D. They move west to east, and are slower than longwaves.