Exam 12: Soils

Humus eventually becomes litter.

The following is not an important soil microorganism:

The soils which are red with a surface layer containing much aluminum and iron are ________.

Sandstone bedrock usually produces a coarse soil which is easily penetrated by water and air.

The size groups within the standard classification of soil particle sizes are termed ________.

________ are soils of many widely scattered locations whose common characteristic is a lack of maturity.

This type of water is held to soil particles by adhesion and is normally unavailable to plants.

The minerals that form cations are known as ________.

The main soil order adapted to wet-dry cycles and having clayey surfaces is ________.

The unconsolidated parent material beyond the reach of most roots is ________.

Organic matter usually comprises about ________ percent of total soil volume.

A soil series is ________.

Distinguish texture from structure.

The soil-forming factor which is said to make soil more than "just dirt" is the ________ factor.

Air within the soil is usually highly saturated and rich in ________.

Which of the following is NOT a property of soil clay?

A dense layer, often forming in the B horizon under calcification is ________.

________ is the soil order covering the greatest surface area on Earth.

The less the colloidal content of the soil, the greater its inherent fertility.

Podzols are a type of soil which evolve in the world's arid climates.