Biodiversity in extensive dead zones of both freshwater and marine ecosystems is mainly caused by pollution from
A) endocrine (hormone) disruptors.
B) DDT.
C) nitrogen and phosphorus nutrients used in agriculture.
D) untreated sewage from most large U.S. cities.
C
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All waterfalls eventually disappear because headward erosion slowly eats back the resistant ledge.
a. true b. false
In the Pacific Ocean, Walker cell circulation is associated with
A. eastward surface winds moving away from the Pacific warm pool. B. westward surface winds moving away from the Pacific warm pool. C. eastward surface winds moving toward the Pacific warm pool. D. westward surface winds moving toward the Pacific warm pool.
Which of the following is a common, approximate value for the angle of repose of rock particles?
a. 3? b. 13? c. 33? d. 73? e. 133?
In January, the thermal equator
A) trends southward into the interior of South America and Africa. B) peaks in the interior of Eurasia. C) is not influenced by continentality. D) trends northward over all ocean basins.