How freely water will flow through the open spaces in soil is called _____.

• particle size
• permeability
• quality
• composition

Soil particles that are larger than 2mm are called _____.

• sand
• silt
• clay
• gravel

Soil ______ depends on the particle sizes and their relative proportions within the soil.

• pH
• mixtures
• texture
• humus

The sand, silt, and clay portion of soil comes from weathered _____ material.

• parent
• bedrock
• plant
• insect

The decayed organic matter in soil is _____.

• humus
• parent material
• silt
• loam

Soil ____ describes what the soil is made of, what is contained within it.

• composition
• texture
• particle size
• permeability

Soils form in layers, or _____.

• top soils
• mixtures
• horizons
• levels

Measuring ____ involves calculating the rate of drainage.

• particle size
• permeability
• quality
• composition

Most plants grow best in soils with a pH between _____.

• 1 and 4
• 4 and 10
• 5 and 7
• 6 and 12

Name the soil horizon: O layer

• parent material
• organic layer
• subsoil
• topsoil