You are working with a soil colloid known to have a reasonably high potassium level, a cation exchange capacity of about 20 cmolc/kg of clay and little tendency to swell when wetted. Which of the following is it most apt to be the dominant clay mineral in this soil?
A) kaolinite
B) vermiculite
C) humus
D) fine-grained mica
E) smectite
D
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The best thermal efficiency of power plants is, on the average, _____.
a. 15 percent b. 30 percent c. 40 percent d. 55 percent
La recuperación elástica es un término que se utiliza para describir:
a. el retorno de la zapata de la dobladora a su posición normal después de realizar un codo. b. la reacción de una dobladora eléctrica después de que la máquina se desplace. c. la tendencia de la tubería eléctrica a relajarse hacia un ángulo de curvatura ligeramente inferior al indicado por el puntero de la dobladora cuando se libera la dobladora. d. la cantidad de corrección-ajuste necesaria para un codo de radio amplio.
The sectional view is created by placing an imaginary _________________________ through the object cutting away the area to be exposed.
Fill in the blank(s) with the appropriate word(s).
Net primary (photosynthetic) productivity (NPP) is:
A. the carbon fixed by the leaves of the plant and not secondary photosynthesizing organs. B. the amount of biomass that goes into the harvested part of the plant. C. carbon fixed minus the amount given off through respiration. D. carbon fixed plus the amount given off through respiration.