Soil Horizons

How is a soil broken down into basic properties?

• By analyzing its texture, structure, and composition

• By measuring its temperature and humidity

• By observing its color and smell

• By testing its pH level only

Fill in the blank: The 'CL' in CLORPTT stands for _______.

• Climate

• Cloud

• Clarity

• Cliff

Fill in the blank: The 'P' in CLORPTT stands for _______.

• Parent Material

• Photosynthesis

• Precipitation

• Pressure

Which of the following is not a master horizon?

• O

• A

• D

• C

What is the correct order of soil layers from top to bottom as shown in the diagram?

• A) Organic (Litter layer), Topsoil, Leaching layer, Subsoil, Weathered parent material, Parent material

• B) Parent material, Weathered parent material, Subsoil, Leaching layer, Topsoil, Organic (Litter layer)

• C) Topsoil, Organic (Litter layer), Leaching layer, Subsoil, Parent material, Weathered parent material

What does the 'O' in 'O Horizon' stand for?

• Organic

• Oxide

• Oxygen

• Obsidian

Are O horizons nearly entirely organic matter?

• True

• False

In which type of soils are O horizons not common in Oregon?

• Sandy soils

• Clay soils

• Loamy soils

• Silty soils

How is the A horizon identified?

True or False: You will see an E horizon in all Oregon soils.

• True

• False