Demand for which of the following resources has skyrocketed in recent years?
A) Gas hydrates
B) Manganese nodules and crusts
C) Phosphorite
D) Rare-earth elements
E) Sand and gravel
D
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Cities are distinguished by their
A. Dependence on natural resource-based occupations B. Strong traditions and cultural character C. Differentiated, specialized jobs and functions D. Sheer size E. Large groups of interdependent households
What is the relationship between continent edges and plate boundaries?
a) No plate boundaries follow the edges of continents. b) Most plate boundaries follow the edges of continents. c) Almost all plate boundaries follow the edges of continents. d) Very few plate boundaries follow the edges of continents.
Which of the following characterizes a tropical savanna climate?
A) It experiences a summer wet season. B) Its annual temperature variability is less than that of the tropical rain forest. C) The suns direct rays are overhead (subsolar point) twice each year. D) It is dominated by the ITCZ for nearly 12 months of the year. E) All months receive precipitation in excess of 6 cm (2.4 in.).
Which of the following best matches the description?Attached organisms in freshwater streams and rivers.
A. deciduous forest B. periphyton C. benthic D. marsh E. phytoplankton F. pioneer community G. boreal forest H. biochemical oxygen demand I. desert J. euphotic K. littoral zone L. savanna M. tundra N. grassland O. pelagic