Why are soil colloids important in soils?
A) Soil colloids have a neutralizing effect, increasing the overall alkalinity of soil and making them prime for certain agricultural crops.
B) Soil colloids are an indication of soil moisture. The higher number of colloids, the greater the soil moisture is.
C) Without colloids, leaching will dissolve important chemicals from the soil, making them unavailable to plant.
D) Soil colloids is a measure of the maximum water available for plants use after the water has drained from large pore spaces.
E) As one of the shapes of an individual ped, soil colloids control rooting of plants.
C
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Estimate the amount of electrical energy consumed during a year for a case when a garage door is lifted four times each day. Assume the garage door opener has a 1?2-hp rated motor and it takes 14 s to lift the garage door.
What will be an ideal response?
Examine these atomic models and answer the question that follows. The filled black circles represent electrons. (Note: Electrons and nucleus are not drawn to scale.)Assuming that the number of electrons is the same as the number of protons (which is not always the case), which picture represents the atom of carbon that has an atomic number of 6?
When the EPA began risk assessment in the mid-1970s, it was primarily concerned with
A) the safety of public transportation systems. B) interactions between people and wildlife in national parks. C) cancer risks associated with pesticides and toxic chemicals. D) accidents associated with lost time on the job and workers' compensation.
Which of the following is NOT something we can learn by determining isotopic ages?
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