Irrigation can result in the salinization of soils because ________
A) irrigation is typically used in areas where windblown salts from sea spray can accumulate when the protective vegetation is removed
B) the irrigation water washes away soil leaving behind concentrated salts
C) many of the plants grown in these regions excrete salts into the soil
D) salts are deposited on the soil surface as water evaporates
E) shortages of fresh water require the use of saltwater for irrigation
D
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The Netherlands, meaning "Low Countries" included the following except
A. The Netherlands B. Denmark C. Belgium D. Luxembourg
Judge the following sentence according to the criteria given below: Clay minerals are the most
important minerals in soils BECAUSE clays adsorb a great deal of water and plant nutrients due to a high surface area to volume ratio. a. The assertion and the reason are both correct, and the reason is valid. b. The assertion and the reason are both correct, but the reason is invalid. c. The assertion is correct, but the reason is incorrect. d. The assertion is incorrect, but the reason is correct. e. Both the assertion and the reason are incorrect.
Loess is a fine, fertile silt that is deposited by the receding flood waters
Indicate whether the statement is true or false
Whether volcanic eruptions are very explosive or relatively quiet is largely determined by
A. the ease or difficulty with which the gas escapes to the atmosphere B. the viscosity of a lava C. the amount of gas in the lava or magma D. all of the preceding