SOIL PROCESSES

..... (occurs in A Horizon) is the downward movement or the physical down washing of small particles such as clay and humus from the upper layer of the soil to the lower layer by downward precipitation.

..... is the process by which organic matter is decomposed to form humus with the aid of bacteria and fungi

In this process, soil components are moved in any form or direction with the influence of moisture

In the process of _____________, soluble materials are removed especially when precipitation exceeds evapotranspiration rates.

...is the process by which calcium or carbonate minerals are removed from the soil

....occurs in the hot, rainy tropics where chemical weathering proceeds at a rapid rate, and usually gives a deep red soil colour.

....occurs when the output of water from the soil is restricted, thus, giving anaerobic or waterlogged conditions