Alternate freezing and thawing of soils results in the heaving of plants and the destruction of shallow building foundations. This effect is due primarily to ________.
A) the hydration of adsorbed cations on the soil colloids
B) the expansion of water when it freezes
C) pressure from upward movement of water from lower horizons
D) the breaking down of soil aggregates due to freezing and thawing
E) the wetting and drying of swelling-type clays
Question 2
A mineral soil has a water content of 25 kg water per 100 kg dry soil. What is the approximate specific heat of this soil, expressed in calories per kilogram?
A) 250 B) 450 C) 590 D) 360 E) 640
Dried dead plants
Plants
Plants
Plants
Plants
The traits Mendel used in his experiments, and the results of the F1 and F2 generation crosses.