Question
A soil scientist compares two soils formed under contrasting climatic conditions: one developed under intense weathering and heavy rainfall in a humid tropical region, showing accumulation of iron and aluminium oxides with loss of silica, and the other developed under cold, humid conditions beneath coniferous forest, showing a pale, ash-grey, leached surface horizon with accumulation of iron, aluminium and organic matter in the horizon below. Which pair of soil-forming processes, respectively, describes these two soils?
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