Of the major air pollutants monitored by the EPA, which one is found above recommended levels in more U.S. counties than any other?
A) particulate matter B) carbon monoxide C) sulfur dioxide D) ozone
D
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What explains why the ocean's sedimentary "memory" does not correspond to the reasoning of W. J. Sollas?
A) Samples cannot be attained in deep water. B) Deep sea sediment records are unable to survive subduction. C) Oozes proliferated along the mid-Atlantic ridge. D) All of these choices
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.
In the Northern Hemisphere about ________ percent of the surface is land
A) 7 B) 39 C) 56 D) 75 E) 91
What climatic conditions are most conducive to solifluction? What will be an ideal response?