Exam 18: The Geography of Soils

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

The A horizon is also commonly called topsoil.

Soils are remarkably uniform from the surface to bedrock.

All organisms living in,on,and over the influence the organic content and chemical characteristics of soil.

Which of the following best describes soil?

Human activities,such as agriculture and cattle grazing,may affect soil development.

Pedology is concerned with the practical use of a soil as a medium for plant growth.

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

Which is the smallest natural lump or cluster of soil particles?

The horizon that is commonly called topsoil is which horizon?

How is the soil at the base of a hillslope likely to compare to the soil on the slope?

Where is podzolization likely to occur?

Vertisolic soils have several very distinct horizons.

A few centimeters' thickness of prime farmland soil may require 500 years to mature.

List and briefly describe the various chemical properties used to differentiate soils.

Practices such as no-till agriculture may help mitigate against soil erosion.

Where are Cryosolic soils most likely to be found?

In terms of pedogenic regimes,which is soil acidification associated with forest soils in cool climates?

Organic soils develop in cold,arid climates.

Evaporites,common where salinization occurs,are mined commercially from lakebeds in which of the following?