How do soils that form in humid regions differ from soils that ...

[BrownTown3]

How do soils that form in humid regions differ from soils that form in semi-arid regions in the
  environments in which they form and in their basic characteristics? What will be an ideal response?

Question 2

Briefly explain the sequence in which a soil develops. What will be an ideal response?

[Ddddd]

Answer to Question 1

Soils that form in semi-arid regions contain less organic matter than the soils of more humid areas, so
horizon A is lighter colored and contains more unstable minerals because of less intense chemical
weathering. Calcium carbonate precipitates in horizon B, forming caliche, as soil water evaporates.
Soils that form in humid regions have most of the soluble minerals are leached from horizon A, but
that horizon contains abundant organic matter. Aluminum-rich clays and iron oxides tend to
accumulate in horizon B.

Answer to Question 2

Soil formation begins at the surface and proceeds downward. The process begins with the weathering
of bedrock, a stage that resembles soil horizon C, and proceeds from increased leaching, organic
activity, and organic material content to the formation of humus, or soil horizon O.