How many structural isomers are there for a compound having the molecular formula C3H9N?
A. one
B. two
C. three
D. four
Answer: D
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Which of the following rock types is not characteristic of volcanic domes?
A) Glassy volcanic rocks that are unstable over time B) Vesicular basalt with very large holes from dangerous gas C) Volcanic breccia formed by fracturing of the outer part of the dome D) Mixtures of pieces of the dome and ash from dome collapse
What type of basaltic feature is shown in this photograph?
A) Vesicles
B) Volcanic bomb
C) Aa lava flow
D) Pahoehoe lava flow
E) Pyroclastic flow
Even though many Europeans emigrated during its demographic transition, many European countries now
A) encourage new immigration, especially from their former colonies. B) are open-minded and welcoming of Muslims. C) discourage immigration, even from their former colonies. D) have developed easier methods for existing immigrants to achieve citizenship.
What are the three types of stress, and how do they affect rocks? What will be an ideal response?