The pore space, or porosity, of soils composed mainly of clays is generally
A) less than that in soils composed mainly of sands because the grains in clays fit together very well compared to sands.
B) less than that in soils composed mainly of sands because clay soils usually have more abundant organic matter than sandy soils.
C) greater than that in soils composed mainly of sands because the grains in clays do not fit together very well compared to sands.
D) greater than that in soils composed mainly of sands because clay soils usually have less organic matter than sandy soils.
C) greater than that in soils composed mainly of sands because the grains in clays do not fit together very well compared to sands.
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The Environmental Protection Agency administers the ____________________ that sets the standards for allowed levels of key water pollutants.
Fill in the blank(s) with the appropriate word(s).
The vector quantity is represented by
A) beta sequencing. B) a line. C) time over distance. D) an arrow.
A soil E horizon is an eroded horizon
Indicate whether the statement is true or false
Why must carbohydrates, fats and proteins be broken down into small molecules?
A) So they can be absorbed through the walls of the stomach. B) So they can be absorbed through the walls of the intestines. C) So they can be properly excreted. D) So we can enjoy their tastes and aromas.