After World War II, what was discovered about the ocean floor?
a. Earthquakes occur at extreme depths at oceanic ridges.
b. The seafloor is much thicker than was previously expected.
c. A deep-sea trench system winds through the centers of all the major oceans.
d. There is no oceanic crust older than 180 million years old.
e. There is no oceanic crust that is younger than 180 million years old.
d. There is no oceanic crust older than 180 million years old.
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All of the following statements about Mahayana Buddhism are true, EXCEPT
A) it is a nonexclusive religion. B) it is strongest in Southeast Asia. C) it holds that bodhisatvas help people reach liberation. D) it emphasizes liberation from the cycle of rebirth. E) it originated in India.
Sandstone-carbonate-shale assemblages are characteristic of the late continental rifting phase of
the Wilson cycle, when passive margins develop.
Which of the following rock types represents the highest grade of metamorphism?
A) slate B) phyllite C) schist D) gneiss
The most common end product of the chemical weathering of quartz is
A. calcite B. clay minerals C. pyroxene D. amphibole E. Quartz does not usually weather chemically.