Question 1
Which soil horizon represents the lowest part of the zone of accumulation, also referred to as the subsoil?
◦ soil
◦ dirt
◦ sol
◦ solt
Question 2
Deforestation of rain forests exposes tropical soils that are famous for their low fertility, despite the fact that they had previously hosted a lush tropical forest. Which soil type would describe these soils?
◦ Andisols–young soils formed on volcanic ash and volcanogenic sediment.
◦ Histosols–Organic soils with little or no climatic implications. Can be found in any climate where organic debris can accumulate to form a bog soil. Dark, partially decomposed organic material commonly referred to as
peat.◦ Oxisols–Soils that occur on old land surfaces unless parent materials were strongly weathered before they were deposited. Rich in iron and aluminum oxides, Oxisols are heavily leached, hence are poor soils for agricultural activity.
◦ Vertisols–Soils containing large amounts of clay, which shrink upon drying and swell with the addition of water. Found in subhumid to arid climates.
Fertility and Population Density, 1850
Deforestation
Temperate rain forest "الغابات المطيرة المعتدلة"
Total Fertility Rate in the United States, 1860–2008
Rain exercise
Coniferous forests on the world map