Soils 205 Oregon State University Midterm #1 Updated Actual Questions And Correct Answers

SOILS 205 OREGON STATE UNIVERSITY
MIDTERM #1 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Question:
1. Soil is
Answer:
a 4-dimentional complex habitat; a self-organizing natural body

Question:
2. Soil Profile
Answer:
a vertical section of the soil through all its horizons

Question:
3. Soil Horizons
Answer:
a layer of a soil profile that differs in properties and characteristics from adjacent layers

Question:
4. The master horizons
Answer:
O,A,E,BC

Question:
5. four components of soil
Answer:
Minerals, organic material, water, and air

Question:
6. six functions of soil
Answer:
1. Supports plant growth
2. Recycles nutrients and waste
3. Provides habitat for living things
4. Modifies the atmosphere
5. Functions as building material or base
6. Controls flow and purity of water

Question:
7. five factors of soil formation
Answer:
Soil = f(cl,o,r,p,t) Climate Organisms Topography Parent material and Time

Question:
8. Igneous

, Answer:
Cooled magma (e.g., granite, basalt)

Question:
9. Sedimentary
Answer:
Formed from eroded materials compressed into a solid mass (e.g., limestones, sandstones, shale)

Question:
10. Metamorphic
Answer:
Rock transformed by heat and pressure (e.g., marble, slate)

Question:
11. Clay
Answer:
<0.002 mm

Question:
12. Silt
Answer:
0.05 - 0.002 mm

Question:
13. sand
Answer:
2.00 - 0.05 mm

Question:
14. Soil Order 1-6
Answer:
entisols inceptisols gelisols histosols andisols aridisols

Question:
15. Entisols
Answer:
Little or no evidence of development of horizons. First in the soil order.

Question:
16. Inceptisols
Answer:
Some horizon development, but still has primary minerals Second in the soil order.

Question:
17. Gelisols
Answer:
third in the soil order