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.
Question 2
In terms of dating of specific rocks, structures, or landscapes, relative age refers to
A) the approximate age of geological features based on the period or epoch in which they occurred. For instance, noting a feature is from the Cretaceous.
B) the age of one feature with respect to another within a sequence of events and deduced from the positions of rock strata above and below one another.
C) an educated guess of the rocks age based on its crystalline structure.
D) the age of geological features based on radiometric dating techniques.
E) the inability to ascertain exact age through isotopic methods and the necessity to provide a date range for such features.
A soil surface crust that includes nitrogen-fixing, soil-enriching cyanobacteria.
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Soil is a crucial part of the nitrogen cycle
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