USDA SOIL CLASSIFICATION

Question 1

Soils with permafrost within 2m of the soil surface (very cold)

Answer 1

Gelisols

Question 2

Organic Soils (>20% organic matter), deep organic matter, wet conditions

Answer 2

Histosols

Question 3

Acid forest soils with a subsurface accumulation of metal-humus complexes (cool, wet, sand, acid, coniferous forest)

Answer 3

Spodosols

Question 4

Soils formed in volcanic ash (mild weathering)

Answer 4

Andisols

Question 5

Intensely weathered soils of tropical and subtropical environments (wet, tropical, ion activity, clays, extreme weathering)

Answer 5

Oxisols

Question 6

Clayey soils with high shrink/swell capacity (high base, dry season)

Answer 6

Vertisols

Question 7

Soils of arid environments with subsurface horizon development (desert conditions)

Answer 7

Aridisols

Question 8

Strongly leached soils with subsurface clay accumulation and <35% base saturation (strongly acid, clays, wet, warm, acid silicate and oxides)

Answer 8

Ultisol

Question 9

Grassland soils with high base saturation (soft, dark, semiarid to moist)

Answer 9

Mollisols

Question 10

Moderately leached soils with subsurface clay accumulation and >35% base saturation (mildly acid, clays, moist)

Answer 10

Alfisols

Question 11

Soils with weakly developed subsurface horizons (not much B Horizon development)

Answer 11

Inceptisols

Question 12

Recent soils/Other soils

Answer 12

Entisol