Soils iClicker Quiz 2

Question 0

Soil color factors

Answer 0

Organic matter, water, presence and oxidation state of iron and manganese

Question 1

Soil properties

Answer 1

Color, texture, structure, density, porosity, compaction

Question 2

Chart used for soil color

Answer 2

Munsell color chart

Question 3

10YR 5/6

What does this describe?

Answer 3

Hue
Value
Chroma

Question 4

Soil texture

Answer 4

Different sized particles

Question 5

Soil texture influences:

Answer 5

Bulk density, water holding capacity, cation(gas) exchange, aeration, erodability, drivability, strength

Question 6

Sand size?

Answer 6

2 - .05 mm

Question 7

Silt size?

Answer 7

.05 - .002 mm

Question 8

Clay size?

Answer 8

.002 >

Question 9

Is silt cohesive?

Answer 9

No

Question 10

______ - many primary soil particles held in a single cluster

Answer 10

Aggregate

Question 11

Physical processes of soil aggregates

Answer 11

Wetting drying, freezing thawing

Question 12

Biological processes of soil aggregates

Answer 12

Burrowing organisms, plant root extension, root, fungal, and bacterial secretions

Question 13

2 types of soil density?

Answer 13

Particle density - mass of solids/volume of solids

Bulk density - mass of solids/ volume of soil

Question 14

Percentage if earth’s freshwater in soils?

Answer 14

33%

Question 15

Forces that affect potential energy of soil water:

Answer 15

Gravity
Matric
Osmotic

Question 16

3 types of water movement in soil:

Answer 16

Saturated flow : gravity
Unsaturated flow: matric
Vapor flow

Question 17

Field capacity:

Answer 17

Only water held against gravity renaming

-10 to -30 kPa

Question 18

Per meant wilting point:

Answer 18

When plant roots can no longer extract water

Around - 1500 kPa