Which of the following is an example of a polyester?
A) Lexan
B) nylon-66
C) polystyrene
D) poly(ethylene terephthalate)
D
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One mineral is held together by van der Waal's forces and the other is held together by metallic bonds. Which is stronger?
A) They are equally strong. B) They are equally weak. C) The mineral held together by metallic bonds is stronger. D) The mineral held together by van der Waal's forces is weaker.
Which of the following is correct regarding the soil physical property of soil?
A) Dark soils always indicate high organic content. B) Despite the imporantance of color in describing soils, there is no standard methods for standardized descriptions. C) Soil color is used solely to determine the moisture content of soil—darker soils have a higher moisture content, whereas lighter soils have less water content. D) Color reflects composition and chemical makeup of a soil.
The difference between the photosynthetic production of carbohydrates and the respiration loss of carbohydrates is known as
A) net primary productivity. B) compensation point. C) free air CO2 enrichment. D) net photosynthesis.
A convergent plate boundary is most likely associated with a(n)
A. oceanic trench. B. transform fault. C. linear chain of islands. D. mid-ocean ridge. E. None of these choices are correct.