Exam 18: The Geography of Soils

In which of the following areas would one likely find Oxisols?

Both Gelisols and Histosols have high organic matter content.

A dark colored soil always indicates high organic content.

Biological activity by plant roots or tunnelling animals tends to diminish porosity.

These mature soils are found in the tropics.

In regards to soil-formation, which of the following best describes the role of climate?

Soils with volcanic parent material belong to which soil order?

Warming temperatures have accelerated the thawing of Gelisols. This is of particular concern because

The horizon identified as regolith is the ________ horizon.

Over 15,000 soil series have been classified up to this time in the United States and Canada.

Spodosols are solely associated with the northern coniferous forest and are never found within mixed or deciduous forests.

Though Oxisols occur in the world's tropical rain forests, they tend to be poor in inorganic nutrients.

These grassland soils are some of the Earth's most significant agricultural soils.

A vertical cross section of soil extending from the surface to the deepest extent of plant root activity or to the regolith and bedrock is known as a

Entisols have several very distinct horizons.

The practice of leaving crop residue on the field between plantings to help prevent soil erosion is known as

There is little evidence that human activity has an impact on soils.

Worldwide, desertification is affecting an estimated ________ people.

The smallest natural lump or cluster of soil particles is known as a

A soil order is the lowest and most precise level of the Soil Taxonomy system.