WHAT IS THE LAYER OF THE SOIL??

O  - ORGANIC LAYER

Dominated by organic material, consisting of undecomposed or partially decomposed plant  materials, such as dead leaves.

A  - TOPSOIL

Largely material soil developed from parent material; organic matter leached from above gives this horizon a distinctive dark colour.

B  - SUBSOIL

Accumulation of mineral particles such as clay and salts leached from topsoil; distinguished based on colour, structure, and kind of material accumulated from leaching.

C  - SUBSTRATUM

Unconsolidated material derived from the original parent materials from which the soil developed.

SOIL LAYER also known as HORIZON developed because of:

• ·         Amount of humus accumulated

• ·         Differences in weathering with depth

• ·         Translocation of COLLOIDS by water

• ·         Other accumulation or looses