What kind of erosion produces sinkholes?
A. wind erosion
B. ocean wave erosion
C. groundwater erosion
D. stream erosion
Answer: C
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The solvent diethyl ether can be mixed with water but only by shaking the two liquids together. After the shaking is stopped, the liquids separate into two layers, much like oil and vinegar. The free-base form of the alkaloid caffeine is readily soluble in diethyl ether but not in water. Suggest what might happen to the caffeine of a caffeinated beverage if the beverage was first made alkaline with sodium hydroxide and then shaken with some diethyl ether.
A. The water layer would turn a pink color indicating an alkaline pH. B. The caffeine would transform into the free acid and transfer into the diethyl ether. C. The caffeine would transform into the free base and transfer into the diethyl ether. D. The diethyl ether and water would mix into one layer.
The federal government is the principal participant in the cleanup of abandoned hazardous-waste sites.
Answer the following statement true (T) or false (F)
Deserts are primarily located in hot, tropical regions.
Answer the following statement true (T) or false (F)
What interior layer of Earth is entirely molten?
A. lithosphere B. crust C. mantle D. inner core E. outer core