CRSS Exam 1 Questions and Answers All Correct
Number of years ago that North America and Africa collided - Answer- 450 Mya
Geometric shape si forms when bonded to 4 oxygens - Answer- Tetrahedron
Name of N containing functional group on hummus that can be positively charged - Answer- Not s...
most common soil order in Georgia - Answer- ultisols
, t/f- cation exchange capacity is the ability of a soil to attract negatively charged ions -
Answer- False (its attracts cations duh)
which soil colloid has the greatest amount of permanent negative charge - Answer- 2:1
clays
what is most likely subsurface diagnostic horizon for a soil with minimal development
(blocky reddish color) but no clay films or illuvial humus - Answer- cambic
which mineral is very soluble in a humid temperate climate - Answer- gypsum
what happens to soil ph when you add calcium - Answer- decreases, basic
two soil components that have appreciable pH dependent charge - Answer- Fe oxides
and humus
T/F Sodium causes soil colloids to disperse - Answer- True
soil order--- acidic soil often with bleached horizon overlaying a dark brown horizon -
Answer- spodosol
element that commonly substitutes for Si in tetrahedra of clay minerals - Answer-
Aluminum
resistant primary mineral common in sand fraction - Answer- Quartz
metamorphic rock common in the piedmont - Answer- gneiss
2:1 clay mineral with very high CEC - Answer- montmillorite
weathering where H+ attacks primary minerals - Answer- hydrolysis
how to calc %BS - Answer- (Ca+Na+Na+K)/CEC=%BS
Iron oxides are primarily responsible for what soil colors? - Answer- Red
Which of the following parent materials is found in floodplains and transported by water?
- Answer- Alluvium
Feldspar +H—-> clay minerals + K is and example of - Answer- Hydrolysis
(Also happens to Muscovite)
In addition to iron name another agent that provides color to the soil? - Answer-
Potassium
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