Soil Lab Quiz-ish Thing

If a sample of wet soil has a mass of 100g and a sample of dry soil has a mass of 75g, what is the water-holding capacity of the soil?

• 25%
• 33%
• 75%
• 42%

What are two factors that can increase the water holding capacity of soil?

• More sand and less silt
• More humus and more clay
• Fewer minerals and fewer organisms
• More clay and less water

Which of the following soil samples has the most decomposed organic matter?

• A
• B
• C
• D

Which soil horizon is largest in a temperate grassland (prairie)?

• O
• A
• E
• R

Which soil horizon is composed of freshly fallen leaves, twigs, and undecomposed dead animals?

• O
• A
• E
• B

Which soil horizon is often called "topsoil"?

• O
• A
• B
• C

Which soil is composed of 35% clay, 55% silt, and 10% sand?

• Sandy clay
• Silty clay
• Silty clay loam
• Clay loam

A soil that has a high percentage of __________ is able to form a long ribbon during soil testing.

• Sand
• Silt
• Clay
• Loam

A soil that has a relatively even mixture of all three mineral particle sizes is known as a ___________.

• Loam
• Humus
• Hydrosol
• Peat

An increase in which soil mineral particle will increase the water permeability of soil?

• Clay
• Silt
• Sand
• Loam