Soils - Study Guide

What are the FIVE soil forming factors? (6.1.1)

What are the SIX soil horizons and how are they characterized? (Our Aunt Erma Bakes Cookies Regularly) (6.1.3)

A soil horizon is a vertical section of soil that extends from the ground surface to the underlying rock (6.1.3)

• True
• False

The most accurate definition of soil is: (6.1.3)

• A substance that farmers use that supports plant growth.
• A mixture of organic matter, mineral components, water, and air that supports plant growth.
• A group of minerals, which are very valuable.
• A substance that is extracted from wells.

Which of the following is NOT a key ingredient of soil? (6.1.3)

• Organic Matter
• Minerals
• Air
• Hemoglobin

What percentage of the average soil is organic matter? (6.1.1)

• 5%
• 25%
• 45%
• 15%

Which soil horizon is known for topsoil (6.1.1)

• A Horizon
• B Horizon
• C Horizon
• R Horizon

Which of the following is not a soil forming factor (6.1.3)

• Climate
• Time
• Organic Matter
• Parent Material

Which soil particle is the largest? (6.1.3)

• Sand
• Silt
• Clay

Using the soil triangle above - please identify what soil texture would be present in 40% CLAY - 10% SILT - 50% SAND (6.1.3)

• Loam
• Sandy Clay
• Sandy Clay Loam
• Silty Clay Loam