If you were looking for oil, what type of contractional structure covered in this chapter would you look for?
What will be an ideal response?
Answer: We would look for a structure that can trap oil, and an anticlinal stack of thrust sheets, such as the example shown in Figure 16.15, would be excellent. It contains several closures in which oil could be trapped, provided there is an impermeable rock (shale) that can act as a cap rock. Fault-bend folds (Figure 16.16–18) would also be good for the same reasons. Even décollement folds could trap some oil if the folds are large, although they are seldom large enough to contain large volumes of hydrocarbons.
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Which statement about urban areas is supported by environmental analysts?
A. Most of the world's urban areas are not environmentally sustainable in the long run. B. Most of the world's urban areas are environmentally sustainable in the long run. C. Since the ecological footprint of a city does not extend beyond its border, cities are models of sustainability. D. The only truly sustainable places occur in large urban areas.
What is absolute dating, and what is it based on? What can absolute dating tell us? What will be an ideal response?
The Arab Spring uprisings were in part the result of
A) technology shaping cultural and political change. B) changes in voting and civil rights. C) the growth of Islamism. D) the growth of Islamism and changes in voting and civil rights. E) American military intervention.
NASA catalogs near-Earth-objects (NEOs) that are larger than ____ in diameter and come within about 75 million km of Earth
a. 10 m b. 100 m c. 1 km d. 5 km e. 15 km