The vast open ocean is dominated by picoplankton that are efficiently grazed by ________.
A. heterotrophic dinoflagellates
B. ciliates and tintinnids
C. whales
D. copepods
Answer: B
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Which of the following best matches the description?Process in which land is designated for a specific use.
A. multiple land use B. land-use planning C. floodplain D. tract development E. urban sprawl F. wetlands G. megalopolis H. floodplain zoning I. zoning J. ribbon sprawl
Under what conditions is swidden cultivation sustainable?
A) when population densities remain low, and where upland people control enough land B) when there is a large number of people to do the hard, manual labor associated with swidden C) when private entities purchase land for development D) when the government intervenes to control land use E) when long-term weather patterns provide adequate moisture and warmth
On Mohs' hardness scale, ordinary window glass has a hardness of about
A. 7-8 B. 5-6 C. 2-3 D. 3-4
Typically, four to six Rossby waves encompass the earth
Indicate whether the statement is true or false