Why is cation-exchange capacity (CEC) an important soil characteristic?
A) CEC is an indication of the soil permeability; the lower the CEC the higher the permeability.
B) CEC is used to infer soil texture without having to use a soil texture triangle.
C) CEC is an indirect way to measure soil pH; it indicates whether the soil is neutral, alkaline, or acidic.
D) CEC is a measure of soil fertility; the higher the CEC the higher the soil fertility.
D
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What was the most damaging type of eruption that occurred at Vesuvius in Italy?
A) A huge landslide caused a lateral blast that knocked down trees and buildings. B) A fast-moving viscous lava flow flowed through the middle of Pompeii. C) The volcano was so heavy that it caused part of the island to collapse. D) One or more pyroclastic flows hit the city of Pompeii. E) None of these are correct.
Which of the following products is difficult to recycle, clogs sewer pipes, and kills thousands of marine mammals and turtles every year?
A) Aluminum and steel cans B) Plastic bottles C) Glass containers D) Thin plastic grocery bags
Glacial Lake Agassiz went through many periods of catastrophic drainage starting at 13,000 years ago. Some of these periods of catastrophic change have been linked to periods of cooling climate,
particularly when the lake drained through the St. Lawrence Seaway and into the North Atlantic. How would the drainage of Lake Agassiz affect the climate to such a degree that cooling would result? What will be an ideal response?
What are the main chemical components of the Sun?
A. Helium and oxygen B. Hydrogen and oxygen C. Hydrogen and helium D. None of these choices are correct