Basic Soil Orders

Question 1

Moderately weathered soils that form under boreal forest or broadleaf deciduous forest, rich in iron and aluminum

Answer 1

Alfisols (High Nutrient Soils)

Question 2

Clay particles accumulate in a subsurface layer in response to leaching environments

Answer 2

Alfisols (High Nutrient Soils)

Question 3

Fertile, productive soils, because they are neither too wet nor too dry

Answer 3

Alfisols (High Nutrient Soils)

Question 4

Young soils in which the parent material is volcanic ash and cinders deposited by recent volcanic activity

Answer 4

Andisols (Volcanic Soils)

Question 5

Soils that develop in dry places

Answer 5

Aridisols (Desert Soils)

Question 6

Insufficient water to remove soluble minerals; may have an accumulation of calcium carbonate gypsum or salt in subsoil

Answer 6

Aridisols (Desert Soils)

Question 7

Low organic content

Answer 7

Aridisols (Desert Soils)

Question 8

Young soils having limited development and exhibiting properties of the parent material

Answer 8

Entisols (New Soils)

Question 9

Productivity ranges from very high for some formed on recent river deposits to very low for those forming on shifting sand or rocky slopes

Answer 9

Entisols (New Soils)

Question 10

Young soils with little profile development that occur in regions with permafrost

Answer 10

Gelisols (Permafrost Soils)

Question 11

Low temperatures and frozen conditions for much of the year slow soil-forming processes

Answer 11

Gelisols (Permafrost Soils)

Question 12

Organic soils with little or no climatic implications

Answer 12

Histosols (Organic Soils)

Question 13

Can be found in any climate where organic debris can accumulate to form a bog soil

Answer 13

Histosols (Organic Soils)

Question 14

Dark, partially decomposed organic material commonly referred to as peat

Answer 14

Histosols (Organic Soils)

Question 15

Weakly developed young soil in which the beginning (inception) of profile development is evident

Answer 15

Inceptisols (Young Soils)

Question 16

Most common in humid climates, they exists from the Arctic to tropics

Answer 16

Inceptisols (Young Soils)

Question 17

Native vegetation is most often forest

Answer 17

Inceptisols (Young Soils)

Question 18

Dark, soft soils that have developed under grass vegetation, generally found in prairie areas

Answer 18

Molisols (Prairie Soils)

Question 19

Soil Fertility is excellent

Answer 19

Molisols (Prairie Soils)

Question 20

Found in hardwood forests with significant earthworm activity

Answer 20

Molisols (Prairie Soils)

Question 21

Climatic range is boreal or alpine to tropical

Answer 21

Molisols (Prairie Soils)

Question 22

Dry seasons are normal

Answer 22

Molisols (Prairie Soils)

Question 23

Soils that occur on old land surfaces unless parent materials were strongly weathered before they were deposited

Answer 23

Oxisols (Tropical Forest Soils)

Question 24

Generally found in the tropics and subtropical regions

Answer 24

Oxisols (Tropical Forest Soils)

Question 25

Rich in iron and aluminum oxides and are heavily leached hence poor soils for agricultural activity

Answer 25

Oxisols (Tropical Forest Soils)

Question 26

Soils found only in humid regions on sandy material

Answer 26

Spodosols (Conifer Forest Soils)

Question 27

Common in northern coniferous forests and cool humid forests

Answer 27

Spodosols (Conifer Forest Soils)

Question 28

Beneath the dark upper horizon of weathered organic material lies a light- colored horizon of leached material, the distinctive property of this soil

Answer 28

Spodosols (Conifer Forest Soils)

Question 29

Soils that represent the products of long periods of weathering

Answer 29

Ultisols (Low-Nutrient Soils)

Question 30

Water percolating through the soil concentrates clay particles in the lower horizons (argillic horizons)

Answer 30

Ultisols (Low-Nutrient Soils)

Question 31

Restricted to humid climates in the temperature regions and the tropics where the growing season is long

Answer 31

Ultisols (Low-Nutrient Soils)

Question 32

Abundant water and a long frost-free period contribute to extensive leaching, hence poorer soil quality

Answer 32

Ultisols (Low-Nutrient Soils)

Question 33

Soils containing large amounts of clay, which shrink upon drying and swell with the addition of water

Answer 33

Vertisols (Swelling Clay Soils)

Question 34

Found in subhumid to arid climates, provided that adequate supplies of water are available to saturate the soil after periods of drought

Answer 34

Vertisols (Swelling Clay Soils)

Question 35

Soil expansion and contraction exert stresses on human structures

Answer 35

Vertisols (Swelling Clay Soils)