In explaining erosion processes to a friend, which of the following would you say about accelerated erosion?
A) It involves a much less rapid process than geological erosion.
B) It is greatly enhanced by the splash effect of raindrops impacting bare soil.
C) It refers to sediment carried by water flowing at ever greater velocity.
D) it removes more nitrogen from the surface soil than calcium
E) It is increasing in intensity in the United States, especially in the past 10 years.
Question 2
Gypsum is the most widely used chemical for the reclamation of sodic soils. What characteristic likely accounts for this popularity?
A) Gypsum reacts with Na+ ions to form insoluble Na2SO4.
B) Gypsum is abundant and low priced.
C) Gypsum provides sulfates that attract Na+ from the exchange complex.
D) Gypsum forms sulfuric acid that helps reduce the soil pH.
E) Gypsum is quite insoluble so it remains in the soil for long periods of time.
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